1f46b5a66SChristoph Hellwig /* 2f46b5a66SChristoph Hellwig * Copyright (C) 2007 Oracle. All rights reserved. 3f46b5a66SChristoph Hellwig * 4f46b5a66SChristoph Hellwig * This program is free software; you can redistribute it and/or 5f46b5a66SChristoph Hellwig * modify it under the terms of the GNU General Public 6f46b5a66SChristoph Hellwig * License v2 as published by the Free Software Foundation. 7f46b5a66SChristoph Hellwig * 8f46b5a66SChristoph Hellwig * This program is distributed in the hope that it will be useful, 9f46b5a66SChristoph Hellwig * but WITHOUT ANY WARRANTY; without even the implied warranty of 10f46b5a66SChristoph Hellwig * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11f46b5a66SChristoph Hellwig * General Public License for more details. 12f46b5a66SChristoph Hellwig * 13f46b5a66SChristoph Hellwig * You should have received a copy of the GNU General Public 14f46b5a66SChristoph Hellwig * License along with this program; if not, write to the 15f46b5a66SChristoph Hellwig * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16f46b5a66SChristoph Hellwig * Boston, MA 021110-1307, USA. 17f46b5a66SChristoph Hellwig */ 18f46b5a66SChristoph Hellwig 19f46b5a66SChristoph Hellwig #include <linux/kernel.h> 20f46b5a66SChristoph Hellwig #include <linux/bio.h> 21f46b5a66SChristoph Hellwig #include <linux/buffer_head.h> 22f46b5a66SChristoph Hellwig #include <linux/file.h> 23f46b5a66SChristoph Hellwig #include <linux/fs.h> 24cb8e7090SChristoph Hellwig #include <linux/fsnotify.h> 25f46b5a66SChristoph Hellwig #include <linux/pagemap.h> 26f46b5a66SChristoph Hellwig #include <linux/highmem.h> 27f46b5a66SChristoph Hellwig #include <linux/time.h> 28f46b5a66SChristoph Hellwig #include <linux/init.h> 29f46b5a66SChristoph Hellwig #include <linux/string.h> 30f46b5a66SChristoph Hellwig #include <linux/backing-dev.h> 31cb8e7090SChristoph Hellwig #include <linux/mount.h> 32f46b5a66SChristoph Hellwig #include <linux/mpage.h> 33cb8e7090SChristoph Hellwig #include <linux/namei.h> 34f46b5a66SChristoph Hellwig #include <linux/swap.h> 35f46b5a66SChristoph Hellwig #include <linux/writeback.h> 36f46b5a66SChristoph Hellwig #include <linux/statfs.h> 37f46b5a66SChristoph Hellwig #include <linux/compat.h> 38f46b5a66SChristoph Hellwig #include <linux/bit_spinlock.h> 39cb8e7090SChristoph Hellwig #include <linux/security.h> 40f46b5a66SChristoph Hellwig #include <linux/xattr.h> 417ea394f1SYan Zheng #include <linux/vmalloc.h> 425a0e3ad6STejun Heo #include <linux/slab.h> 43f7039b1dSLi Dongyang #include <linux/blkdev.h> 444b4e25f2SChris Mason #include "compat.h" 45f46b5a66SChristoph Hellwig #include "ctree.h" 46f46b5a66SChristoph Hellwig #include "disk-io.h" 47f46b5a66SChristoph Hellwig #include "transaction.h" 48f46b5a66SChristoph Hellwig #include "btrfs_inode.h" 49f46b5a66SChristoph Hellwig #include "ioctl.h" 50f46b5a66SChristoph Hellwig #include "print-tree.h" 51f46b5a66SChristoph Hellwig #include "volumes.h" 52925baeddSChris Mason #include "locking.h" 53f46b5a66SChristoph Hellwig 546cbff00fSChristoph Hellwig /* Mask out flags that are inappropriate for the given type of inode. */ 556cbff00fSChristoph Hellwig static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) 566cbff00fSChristoph Hellwig { 576cbff00fSChristoph Hellwig if (S_ISDIR(mode)) 586cbff00fSChristoph Hellwig return flags; 596cbff00fSChristoph Hellwig else if (S_ISREG(mode)) 606cbff00fSChristoph Hellwig return flags & ~FS_DIRSYNC_FL; 616cbff00fSChristoph Hellwig else 626cbff00fSChristoph Hellwig return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 636cbff00fSChristoph Hellwig } 64f46b5a66SChristoph Hellwig 656cbff00fSChristoph Hellwig /* 666cbff00fSChristoph Hellwig * Export inode flags to the format expected by the FS_IOC_GETFLAGS ioctl. 676cbff00fSChristoph Hellwig */ 686cbff00fSChristoph Hellwig static unsigned int btrfs_flags_to_ioctl(unsigned int flags) 696cbff00fSChristoph Hellwig { 706cbff00fSChristoph Hellwig unsigned int iflags = 0; 716cbff00fSChristoph Hellwig 726cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_SYNC) 736cbff00fSChristoph Hellwig iflags |= FS_SYNC_FL; 746cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_IMMUTABLE) 756cbff00fSChristoph Hellwig iflags |= FS_IMMUTABLE_FL; 766cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_APPEND) 776cbff00fSChristoph Hellwig iflags |= FS_APPEND_FL; 786cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NODUMP) 796cbff00fSChristoph Hellwig iflags |= FS_NODUMP_FL; 806cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_NOATIME) 816cbff00fSChristoph Hellwig iflags |= FS_NOATIME_FL; 826cbff00fSChristoph Hellwig if (flags & BTRFS_INODE_DIRSYNC) 836cbff00fSChristoph Hellwig iflags |= FS_DIRSYNC_FL; 846cbff00fSChristoph Hellwig 856cbff00fSChristoph Hellwig return iflags; 866cbff00fSChristoph Hellwig } 876cbff00fSChristoph Hellwig 886cbff00fSChristoph Hellwig /* 896cbff00fSChristoph Hellwig * Update inode->i_flags based on the btrfs internal flags. 906cbff00fSChristoph Hellwig */ 916cbff00fSChristoph Hellwig void btrfs_update_iflags(struct inode *inode) 926cbff00fSChristoph Hellwig { 936cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 946cbff00fSChristoph Hellwig 956cbff00fSChristoph Hellwig inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); 966cbff00fSChristoph Hellwig 976cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_SYNC) 986cbff00fSChristoph Hellwig inode->i_flags |= S_SYNC; 996cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_IMMUTABLE) 1006cbff00fSChristoph Hellwig inode->i_flags |= S_IMMUTABLE; 1016cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_APPEND) 1026cbff00fSChristoph Hellwig inode->i_flags |= S_APPEND; 1036cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_NOATIME) 1046cbff00fSChristoph Hellwig inode->i_flags |= S_NOATIME; 1056cbff00fSChristoph Hellwig if (ip->flags & BTRFS_INODE_DIRSYNC) 1066cbff00fSChristoph Hellwig inode->i_flags |= S_DIRSYNC; 1076cbff00fSChristoph Hellwig } 1086cbff00fSChristoph Hellwig 1096cbff00fSChristoph Hellwig /* 1106cbff00fSChristoph Hellwig * Inherit flags from the parent inode. 1116cbff00fSChristoph Hellwig * 1126cbff00fSChristoph Hellwig * Unlike extN we don't have any flags we don't want to inherit currently. 1136cbff00fSChristoph Hellwig */ 1146cbff00fSChristoph Hellwig void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) 1156cbff00fSChristoph Hellwig { 1160b4dcea5SChris Mason unsigned int flags; 1170b4dcea5SChris Mason 1180b4dcea5SChris Mason if (!dir) 1190b4dcea5SChris Mason return; 1200b4dcea5SChris Mason 1210b4dcea5SChris Mason flags = BTRFS_I(dir)->flags; 1226cbff00fSChristoph Hellwig 1236cbff00fSChristoph Hellwig if (S_ISREG(inode->i_mode)) 1246cbff00fSChristoph Hellwig flags &= ~BTRFS_INODE_DIRSYNC; 1256cbff00fSChristoph Hellwig else if (!S_ISDIR(inode->i_mode)) 1266cbff00fSChristoph Hellwig flags &= (BTRFS_INODE_NODUMP | BTRFS_INODE_NOATIME); 1276cbff00fSChristoph Hellwig 1286cbff00fSChristoph Hellwig BTRFS_I(inode)->flags = flags; 1296cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 1306cbff00fSChristoph Hellwig } 1316cbff00fSChristoph Hellwig 1326cbff00fSChristoph Hellwig static int btrfs_ioctl_getflags(struct file *file, void __user *arg) 1336cbff00fSChristoph Hellwig { 1346cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(file->f_path.dentry->d_inode); 1356cbff00fSChristoph Hellwig unsigned int flags = btrfs_flags_to_ioctl(ip->flags); 1366cbff00fSChristoph Hellwig 1376cbff00fSChristoph Hellwig if (copy_to_user(arg, &flags, sizeof(flags))) 1386cbff00fSChristoph Hellwig return -EFAULT; 1396cbff00fSChristoph Hellwig return 0; 1406cbff00fSChristoph Hellwig } 1416cbff00fSChristoph Hellwig 14275e7cb7fSLiu Bo static int check_flags(unsigned int flags) 14375e7cb7fSLiu Bo { 14475e7cb7fSLiu Bo if (flags & ~(FS_IMMUTABLE_FL | FS_APPEND_FL | \ 14575e7cb7fSLiu Bo FS_NOATIME_FL | FS_NODUMP_FL | \ 14675e7cb7fSLiu Bo FS_SYNC_FL | FS_DIRSYNC_FL | \ 14775e7cb7fSLiu Bo FS_NOCOMP_FL | FS_COMPR_FL | \ 14875e7cb7fSLiu Bo FS_NOCOW_FL | FS_COW_FL)) 14975e7cb7fSLiu Bo return -EOPNOTSUPP; 15075e7cb7fSLiu Bo 15175e7cb7fSLiu Bo if ((flags & FS_NOCOMP_FL) && (flags & FS_COMPR_FL)) 15275e7cb7fSLiu Bo return -EINVAL; 15375e7cb7fSLiu Bo 15475e7cb7fSLiu Bo if ((flags & FS_NOCOW_FL) && (flags & FS_COW_FL)) 15575e7cb7fSLiu Bo return -EINVAL; 15675e7cb7fSLiu Bo 15775e7cb7fSLiu Bo return 0; 15875e7cb7fSLiu Bo } 15975e7cb7fSLiu Bo 1606cbff00fSChristoph Hellwig static int btrfs_ioctl_setflags(struct file *file, void __user *arg) 1616cbff00fSChristoph Hellwig { 1626cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 1636cbff00fSChristoph Hellwig struct btrfs_inode *ip = BTRFS_I(inode); 1646cbff00fSChristoph Hellwig struct btrfs_root *root = ip->root; 1656cbff00fSChristoph Hellwig struct btrfs_trans_handle *trans; 1666cbff00fSChristoph Hellwig unsigned int flags, oldflags; 1676cbff00fSChristoph Hellwig int ret; 1686cbff00fSChristoph Hellwig 169b83cc969SLi Zefan if (btrfs_root_readonly(root)) 170b83cc969SLi Zefan return -EROFS; 171b83cc969SLi Zefan 1726cbff00fSChristoph Hellwig if (copy_from_user(&flags, arg, sizeof(flags))) 1736cbff00fSChristoph Hellwig return -EFAULT; 1746cbff00fSChristoph Hellwig 17575e7cb7fSLiu Bo ret = check_flags(flags); 17675e7cb7fSLiu Bo if (ret) 17775e7cb7fSLiu Bo return ret; 1786cbff00fSChristoph Hellwig 1796cbff00fSChristoph Hellwig if (!is_owner_or_cap(inode)) 1806cbff00fSChristoph Hellwig return -EACCES; 1816cbff00fSChristoph Hellwig 1826cbff00fSChristoph Hellwig mutex_lock(&inode->i_mutex); 1836cbff00fSChristoph Hellwig 1846cbff00fSChristoph Hellwig flags = btrfs_mask_flags(inode->i_mode, flags); 1856cbff00fSChristoph Hellwig oldflags = btrfs_flags_to_ioctl(ip->flags); 1866cbff00fSChristoph Hellwig if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) { 1876cbff00fSChristoph Hellwig if (!capable(CAP_LINUX_IMMUTABLE)) { 1886cbff00fSChristoph Hellwig ret = -EPERM; 1896cbff00fSChristoph Hellwig goto out_unlock; 1906cbff00fSChristoph Hellwig } 1916cbff00fSChristoph Hellwig } 1926cbff00fSChristoph Hellwig 1936cbff00fSChristoph Hellwig ret = mnt_want_write(file->f_path.mnt); 1946cbff00fSChristoph Hellwig if (ret) 1956cbff00fSChristoph Hellwig goto out_unlock; 1966cbff00fSChristoph Hellwig 1976cbff00fSChristoph Hellwig if (flags & FS_SYNC_FL) 1986cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_SYNC; 1996cbff00fSChristoph Hellwig else 2006cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_SYNC; 2016cbff00fSChristoph Hellwig if (flags & FS_IMMUTABLE_FL) 2026cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_IMMUTABLE; 2036cbff00fSChristoph Hellwig else 2046cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_IMMUTABLE; 2056cbff00fSChristoph Hellwig if (flags & FS_APPEND_FL) 2066cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_APPEND; 2076cbff00fSChristoph Hellwig else 2086cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_APPEND; 2096cbff00fSChristoph Hellwig if (flags & FS_NODUMP_FL) 2106cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NODUMP; 2116cbff00fSChristoph Hellwig else 2126cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NODUMP; 2136cbff00fSChristoph Hellwig if (flags & FS_NOATIME_FL) 2146cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_NOATIME; 2156cbff00fSChristoph Hellwig else 2166cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_NOATIME; 2176cbff00fSChristoph Hellwig if (flags & FS_DIRSYNC_FL) 2186cbff00fSChristoph Hellwig ip->flags |= BTRFS_INODE_DIRSYNC; 2196cbff00fSChristoph Hellwig else 2206cbff00fSChristoph Hellwig ip->flags &= ~BTRFS_INODE_DIRSYNC; 2216cbff00fSChristoph Hellwig 22275e7cb7fSLiu Bo /* 22375e7cb7fSLiu Bo * The COMPRESS flag can only be changed by users, while the NOCOMPRESS 22475e7cb7fSLiu Bo * flag may be changed automatically if compression code won't make 22575e7cb7fSLiu Bo * things smaller. 22675e7cb7fSLiu Bo */ 22775e7cb7fSLiu Bo if (flags & FS_NOCOMP_FL) { 22875e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_COMPRESS; 22975e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NOCOMPRESS; 23075e7cb7fSLiu Bo } else if (flags & FS_COMPR_FL) { 23175e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_COMPRESS; 23275e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NOCOMPRESS; 23375e7cb7fSLiu Bo } 23475e7cb7fSLiu Bo if (flags & FS_NOCOW_FL) 23575e7cb7fSLiu Bo ip->flags |= BTRFS_INODE_NODATACOW; 23675e7cb7fSLiu Bo else if (flags & FS_COW_FL) 23775e7cb7fSLiu Bo ip->flags &= ~BTRFS_INODE_NODATACOW; 2386cbff00fSChristoph Hellwig 2396cbff00fSChristoph Hellwig trans = btrfs_join_transaction(root, 1); 2403612b495STsutomu Itoh BUG_ON(IS_ERR(trans)); 2416cbff00fSChristoph Hellwig 2426cbff00fSChristoph Hellwig ret = btrfs_update_inode(trans, root, inode); 2436cbff00fSChristoph Hellwig BUG_ON(ret); 2446cbff00fSChristoph Hellwig 2456cbff00fSChristoph Hellwig btrfs_update_iflags(inode); 2466cbff00fSChristoph Hellwig inode->i_ctime = CURRENT_TIME; 2476cbff00fSChristoph Hellwig btrfs_end_transaction(trans, root); 2486cbff00fSChristoph Hellwig 2496cbff00fSChristoph Hellwig mnt_drop_write(file->f_path.mnt); 2502d4e6f6aSliubo 2512d4e6f6aSliubo ret = 0; 2526cbff00fSChristoph Hellwig out_unlock: 2536cbff00fSChristoph Hellwig mutex_unlock(&inode->i_mutex); 2542d4e6f6aSliubo return ret; 2556cbff00fSChristoph Hellwig } 2566cbff00fSChristoph Hellwig 2576cbff00fSChristoph Hellwig static int btrfs_ioctl_getversion(struct file *file, int __user *arg) 2586cbff00fSChristoph Hellwig { 2596cbff00fSChristoph Hellwig struct inode *inode = file->f_path.dentry->d_inode; 2606cbff00fSChristoph Hellwig 2616cbff00fSChristoph Hellwig return put_user(inode->i_generation, arg); 2626cbff00fSChristoph Hellwig } 263f46b5a66SChristoph Hellwig 264f7039b1dSLi Dongyang static noinline int btrfs_ioctl_fitrim(struct file *file, void __user *arg) 265f7039b1dSLi Dongyang { 266f7039b1dSLi Dongyang struct btrfs_root *root = fdentry(file)->d_sb->s_fs_info; 267f7039b1dSLi Dongyang struct btrfs_fs_info *fs_info = root->fs_info; 268f7039b1dSLi Dongyang struct btrfs_device *device; 269f7039b1dSLi Dongyang struct request_queue *q; 270f7039b1dSLi Dongyang struct fstrim_range range; 271f7039b1dSLi Dongyang u64 minlen = ULLONG_MAX; 272f7039b1dSLi Dongyang u64 num_devices = 0; 273f7039b1dSLi Dongyang int ret; 274f7039b1dSLi Dongyang 275f7039b1dSLi Dongyang if (!capable(CAP_SYS_ADMIN)) 276f7039b1dSLi Dongyang return -EPERM; 277f7039b1dSLi Dongyang 278f7039b1dSLi Dongyang mutex_lock(&fs_info->fs_devices->device_list_mutex); 279f7039b1dSLi Dongyang list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) { 280f7039b1dSLi Dongyang if (!device->bdev) 281f7039b1dSLi Dongyang continue; 282f7039b1dSLi Dongyang q = bdev_get_queue(device->bdev); 283f7039b1dSLi Dongyang if (blk_queue_discard(q)) { 284f7039b1dSLi Dongyang num_devices++; 285f7039b1dSLi Dongyang minlen = min((u64)q->limits.discard_granularity, 286f7039b1dSLi Dongyang minlen); 287f7039b1dSLi Dongyang } 288f7039b1dSLi Dongyang } 289f7039b1dSLi Dongyang mutex_unlock(&fs_info->fs_devices->device_list_mutex); 290f7039b1dSLi Dongyang if (!num_devices) 291f7039b1dSLi Dongyang return -EOPNOTSUPP; 292f7039b1dSLi Dongyang 293f7039b1dSLi Dongyang if (copy_from_user(&range, arg, sizeof(range))) 294f7039b1dSLi Dongyang return -EFAULT; 295f7039b1dSLi Dongyang 296f7039b1dSLi Dongyang range.minlen = max(range.minlen, minlen); 297f7039b1dSLi Dongyang ret = btrfs_trim_fs(root, &range); 298f7039b1dSLi Dongyang if (ret < 0) 299f7039b1dSLi Dongyang return ret; 300f7039b1dSLi Dongyang 301f7039b1dSLi Dongyang if (copy_to_user(arg, &range, sizeof(range))) 302f7039b1dSLi Dongyang return -EFAULT; 303f7039b1dSLi Dongyang 304f7039b1dSLi Dongyang return 0; 305f7039b1dSLi Dongyang } 306f7039b1dSLi Dongyang 307cb8e7090SChristoph Hellwig static noinline int create_subvol(struct btrfs_root *root, 308cb8e7090SChristoph Hellwig struct dentry *dentry, 30972fd032eSSage Weil char *name, int namelen, 31072fd032eSSage Weil u64 *async_transid) 311f46b5a66SChristoph Hellwig { 312f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 313f46b5a66SChristoph Hellwig struct btrfs_key key; 314f46b5a66SChristoph Hellwig struct btrfs_root_item root_item; 315f46b5a66SChristoph Hellwig struct btrfs_inode_item *inode_item; 316f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 31776dda93cSYan, Zheng struct btrfs_root *new_root; 3186a912213SJosef Bacik struct dentry *parent = dget_parent(dentry); 3196a912213SJosef Bacik struct inode *dir; 320f46b5a66SChristoph Hellwig int ret; 321f46b5a66SChristoph Hellwig int err; 322f46b5a66SChristoph Hellwig u64 objectid; 323f46b5a66SChristoph Hellwig u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; 3243de4586cSChris Mason u64 index = 0; 325f46b5a66SChristoph Hellwig 326a22285a6SYan, Zheng ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root, 327a22285a6SYan, Zheng 0, &objectid); 3286a912213SJosef Bacik if (ret) { 3296a912213SJosef Bacik dput(parent); 330a22285a6SYan, Zheng return ret; 3316a912213SJosef Bacik } 3326a912213SJosef Bacik 3336a912213SJosef Bacik dir = parent->d_inode; 3346a912213SJosef Bacik 3359ed74f2dSJosef Bacik /* 3369ed74f2dSJosef Bacik * 1 - inode item 3379ed74f2dSJosef Bacik * 2 - refs 3389ed74f2dSJosef Bacik * 1 - root item 3399ed74f2dSJosef Bacik * 2 - dir items 3409ed74f2dSJosef Bacik */ 341a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 6); 3426a912213SJosef Bacik if (IS_ERR(trans)) { 3436a912213SJosef Bacik dput(parent); 344a22285a6SYan, Zheng return PTR_ERR(trans); 3456a912213SJosef Bacik } 346f46b5a66SChristoph Hellwig 3475d4f98a2SYan Zheng leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 3485d4f98a2SYan Zheng 0, objectid, NULL, 0, 0, 0); 3498e8a1e31SJosef Bacik if (IS_ERR(leaf)) { 3508e8a1e31SJosef Bacik ret = PTR_ERR(leaf); 3518e8a1e31SJosef Bacik goto fail; 3528e8a1e31SJosef Bacik } 353f46b5a66SChristoph Hellwig 3545d4f98a2SYan Zheng memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); 355f46b5a66SChristoph Hellwig btrfs_set_header_bytenr(leaf, leaf->start); 356f46b5a66SChristoph Hellwig btrfs_set_header_generation(leaf, trans->transid); 3575d4f98a2SYan Zheng btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); 358f46b5a66SChristoph Hellwig btrfs_set_header_owner(leaf, objectid); 359f46b5a66SChristoph Hellwig 360f46b5a66SChristoph Hellwig write_extent_buffer(leaf, root->fs_info->fsid, 361f46b5a66SChristoph Hellwig (unsigned long)btrfs_header_fsid(leaf), 362f46b5a66SChristoph Hellwig BTRFS_FSID_SIZE); 3635d4f98a2SYan Zheng write_extent_buffer(leaf, root->fs_info->chunk_tree_uuid, 3645d4f98a2SYan Zheng (unsigned long)btrfs_header_chunk_tree_uuid(leaf), 3655d4f98a2SYan Zheng BTRFS_UUID_SIZE); 366f46b5a66SChristoph Hellwig btrfs_mark_buffer_dirty(leaf); 367f46b5a66SChristoph Hellwig 368f46b5a66SChristoph Hellwig inode_item = &root_item.inode; 369f46b5a66SChristoph Hellwig memset(inode_item, 0, sizeof(*inode_item)); 370f46b5a66SChristoph Hellwig inode_item->generation = cpu_to_le64(1); 371f46b5a66SChristoph Hellwig inode_item->size = cpu_to_le64(3); 372f46b5a66SChristoph Hellwig inode_item->nlink = cpu_to_le32(1); 373a76a3cd4SYan Zheng inode_item->nbytes = cpu_to_le64(root->leafsize); 374f46b5a66SChristoph Hellwig inode_item->mode = cpu_to_le32(S_IFDIR | 0755); 375f46b5a66SChristoph Hellwig 37608fe4db1SLi Zefan root_item.flags = 0; 37708fe4db1SLi Zefan root_item.byte_limit = 0; 37808fe4db1SLi Zefan inode_item->flags = cpu_to_le64(BTRFS_INODE_ROOT_ITEM_INIT); 37908fe4db1SLi Zefan 380f46b5a66SChristoph Hellwig btrfs_set_root_bytenr(&root_item, leaf->start); 38184234f3aSYan Zheng btrfs_set_root_generation(&root_item, trans->transid); 382f46b5a66SChristoph Hellwig btrfs_set_root_level(&root_item, 0); 383f46b5a66SChristoph Hellwig btrfs_set_root_refs(&root_item, 1); 38486b9f2ecSYan, Zheng btrfs_set_root_used(&root_item, leaf->len); 38580ff3856SYan Zheng btrfs_set_root_last_snapshot(&root_item, 0); 386f46b5a66SChristoph Hellwig 387f46b5a66SChristoph Hellwig memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); 388f46b5a66SChristoph Hellwig root_item.drop_level = 0; 389f46b5a66SChristoph Hellwig 390925baeddSChris Mason btrfs_tree_unlock(leaf); 391f46b5a66SChristoph Hellwig free_extent_buffer(leaf); 392f46b5a66SChristoph Hellwig leaf = NULL; 393f46b5a66SChristoph Hellwig 394f46b5a66SChristoph Hellwig btrfs_set_root_dirid(&root_item, new_dirid); 395f46b5a66SChristoph Hellwig 396f46b5a66SChristoph Hellwig key.objectid = objectid; 3975d4f98a2SYan Zheng key.offset = 0; 398f46b5a66SChristoph Hellwig btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); 399f46b5a66SChristoph Hellwig ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, 400f46b5a66SChristoph Hellwig &root_item); 401f46b5a66SChristoph Hellwig if (ret) 402f46b5a66SChristoph Hellwig goto fail; 403f46b5a66SChristoph Hellwig 40476dda93cSYan, Zheng key.offset = (u64)-1; 40576dda93cSYan, Zheng new_root = btrfs_read_fs_root_no_name(root->fs_info, &key); 40676dda93cSYan, Zheng BUG_ON(IS_ERR(new_root)); 40776dda93cSYan, Zheng 40876dda93cSYan, Zheng btrfs_record_root_in_trans(trans, new_root); 40976dda93cSYan, Zheng 41076dda93cSYan, Zheng ret = btrfs_create_subvol_root(trans, new_root, new_dirid, 41176dda93cSYan, Zheng BTRFS_I(dir)->block_group); 412f46b5a66SChristoph Hellwig /* 413f46b5a66SChristoph Hellwig * insert the directory item 414f46b5a66SChristoph Hellwig */ 4153de4586cSChris Mason ret = btrfs_set_inode_index(dir, &index); 4163de4586cSChris Mason BUG_ON(ret); 4173de4586cSChris Mason 4183de4586cSChris Mason ret = btrfs_insert_dir_item(trans, root, 419f46b5a66SChristoph Hellwig name, namelen, dir->i_ino, &key, 4203de4586cSChris Mason BTRFS_FT_DIR, index); 421f46b5a66SChristoph Hellwig if (ret) 422f46b5a66SChristoph Hellwig goto fail; 4230660b5afSChris Mason 42452c26179SYan Zheng btrfs_i_size_write(dir, dir->i_size + namelen * 2); 42552c26179SYan Zheng ret = btrfs_update_inode(trans, root, dir); 42652c26179SYan Zheng BUG_ON(ret); 42752c26179SYan Zheng 4280660b5afSChris Mason ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, 4294df27c4dSYan, Zheng objectid, root->root_key.objectid, 4300660b5afSChris Mason dir->i_ino, index, name, namelen); 43176dda93cSYan, Zheng 4320660b5afSChris Mason BUG_ON(ret); 4330660b5afSChris Mason 43476dda93cSYan, Zheng d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry)); 435f46b5a66SChristoph Hellwig fail: 4366a912213SJosef Bacik dput(parent); 43772fd032eSSage Weil if (async_transid) { 43872fd032eSSage Weil *async_transid = trans->transid; 43972fd032eSSage Weil err = btrfs_commit_transaction_async(trans, root, 1); 44072fd032eSSage Weil } else { 44176dda93cSYan, Zheng err = btrfs_commit_transaction(trans, root); 44272fd032eSSage Weil } 443f46b5a66SChristoph Hellwig if (err && !ret) 444f46b5a66SChristoph Hellwig ret = err; 445f46b5a66SChristoph Hellwig return ret; 446f46b5a66SChristoph Hellwig } 447f46b5a66SChristoph Hellwig 44872fd032eSSage Weil static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, 449b83cc969SLi Zefan char *name, int namelen, u64 *async_transid, 450b83cc969SLi Zefan bool readonly) 451f46b5a66SChristoph Hellwig { 4522e4bfab9SYan, Zheng struct inode *inode; 4536a912213SJosef Bacik struct dentry *parent; 454f46b5a66SChristoph Hellwig struct btrfs_pending_snapshot *pending_snapshot; 455f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 4562e4bfab9SYan, Zheng int ret; 457f46b5a66SChristoph Hellwig 458f46b5a66SChristoph Hellwig if (!root->ref_cows) 459f46b5a66SChristoph Hellwig return -EINVAL; 460f46b5a66SChristoph Hellwig 461a22285a6SYan, Zheng pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS); 462a22285a6SYan, Zheng if (!pending_snapshot) 463a22285a6SYan, Zheng return -ENOMEM; 464a22285a6SYan, Zheng 465a22285a6SYan, Zheng btrfs_init_block_rsv(&pending_snapshot->block_rsv); 466a22285a6SYan, Zheng pending_snapshot->dentry = dentry; 467a22285a6SYan, Zheng pending_snapshot->root = root; 468b83cc969SLi Zefan pending_snapshot->readonly = readonly; 469a22285a6SYan, Zheng 470a22285a6SYan, Zheng trans = btrfs_start_transaction(root->fs_info->extent_root, 5); 471a22285a6SYan, Zheng if (IS_ERR(trans)) { 472a22285a6SYan, Zheng ret = PTR_ERR(trans); 473a22285a6SYan, Zheng goto fail; 474a22285a6SYan, Zheng } 475a22285a6SYan, Zheng 476a22285a6SYan, Zheng ret = btrfs_snap_reserve_metadata(trans, pending_snapshot); 477a22285a6SYan, Zheng BUG_ON(ret); 478a22285a6SYan, Zheng 479a22285a6SYan, Zheng list_add(&pending_snapshot->list, 480a22285a6SYan, Zheng &trans->transaction->pending_snapshots); 48172fd032eSSage Weil if (async_transid) { 48272fd032eSSage Weil *async_transid = trans->transid; 48372fd032eSSage Weil ret = btrfs_commit_transaction_async(trans, 48472fd032eSSage Weil root->fs_info->extent_root, 1); 48572fd032eSSage Weil } else { 48672fd032eSSage Weil ret = btrfs_commit_transaction(trans, 48772fd032eSSage Weil root->fs_info->extent_root); 48872fd032eSSage Weil } 489a22285a6SYan, Zheng BUG_ON(ret); 490a22285a6SYan, Zheng 491a22285a6SYan, Zheng ret = pending_snapshot->error; 492f46b5a66SChristoph Hellwig if (ret) 4932e4bfab9SYan, Zheng goto fail; 494f46b5a66SChristoph Hellwig 49566b4ffd1SJosef Bacik ret = btrfs_orphan_cleanup(pending_snapshot->snap); 49666b4ffd1SJosef Bacik if (ret) 49766b4ffd1SJosef Bacik goto fail; 498f46b5a66SChristoph Hellwig 4996a912213SJosef Bacik parent = dget_parent(dentry); 5006a912213SJosef Bacik inode = btrfs_lookup_dentry(parent->d_inode, dentry); 5016a912213SJosef Bacik dput(parent); 5022e4bfab9SYan, Zheng if (IS_ERR(inode)) { 5032e4bfab9SYan, Zheng ret = PTR_ERR(inode); 5042e4bfab9SYan, Zheng goto fail; 5052e4bfab9SYan, Zheng } 5062e4bfab9SYan, Zheng BUG_ON(!inode); 5072e4bfab9SYan, Zheng d_instantiate(dentry, inode); 5082e4bfab9SYan, Zheng ret = 0; 5092e4bfab9SYan, Zheng fail: 510a22285a6SYan, Zheng kfree(pending_snapshot); 511f46b5a66SChristoph Hellwig return ret; 512f46b5a66SChristoph Hellwig } 513f46b5a66SChristoph Hellwig 5144260f7c7SSage Weil /* copy of check_sticky in fs/namei.c() 5154260f7c7SSage Weil * It's inline, so penalty for filesystems that don't use sticky bit is 5164260f7c7SSage Weil * minimal. 5174260f7c7SSage Weil */ 5184260f7c7SSage Weil static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) 5194260f7c7SSage Weil { 5204260f7c7SSage Weil uid_t fsuid = current_fsuid(); 5214260f7c7SSage Weil 5224260f7c7SSage Weil if (!(dir->i_mode & S_ISVTX)) 5234260f7c7SSage Weil return 0; 5244260f7c7SSage Weil if (inode->i_uid == fsuid) 5254260f7c7SSage Weil return 0; 5264260f7c7SSage Weil if (dir->i_uid == fsuid) 5274260f7c7SSage Weil return 0; 5284260f7c7SSage Weil return !capable(CAP_FOWNER); 5294260f7c7SSage Weil } 5304260f7c7SSage Weil 5314260f7c7SSage Weil /* copy of may_delete in fs/namei.c() 5324260f7c7SSage Weil * Check whether we can remove a link victim from directory dir, check 5334260f7c7SSage Weil * whether the type of victim is right. 5344260f7c7SSage Weil * 1. We can't do it if dir is read-only (done in permission()) 5354260f7c7SSage Weil * 2. We should have write and exec permissions on dir 5364260f7c7SSage Weil * 3. We can't remove anything from append-only dir 5374260f7c7SSage Weil * 4. We can't do anything with immutable dir (done in permission()) 5384260f7c7SSage Weil * 5. If the sticky bit on dir is set we should either 5394260f7c7SSage Weil * a. be owner of dir, or 5404260f7c7SSage Weil * b. be owner of victim, or 5414260f7c7SSage Weil * c. have CAP_FOWNER capability 5424260f7c7SSage Weil * 6. If the victim is append-only or immutable we can't do antyhing with 5434260f7c7SSage Weil * links pointing to it. 5444260f7c7SSage Weil * 7. If we were asked to remove a directory and victim isn't one - ENOTDIR. 5454260f7c7SSage Weil * 8. If we were asked to remove a non-directory and victim isn't one - EISDIR. 5464260f7c7SSage Weil * 9. We can't remove a root or mountpoint. 5474260f7c7SSage Weil * 10. We don't allow removal of NFS sillyrenamed files; it's handled by 5484260f7c7SSage Weil * nfs_async_unlink(). 5494260f7c7SSage Weil */ 5504260f7c7SSage Weil 5514260f7c7SSage Weil static int btrfs_may_delete(struct inode *dir,struct dentry *victim,int isdir) 5524260f7c7SSage Weil { 5534260f7c7SSage Weil int error; 5544260f7c7SSage Weil 5554260f7c7SSage Weil if (!victim->d_inode) 5564260f7c7SSage Weil return -ENOENT; 5574260f7c7SSage Weil 5584260f7c7SSage Weil BUG_ON(victim->d_parent->d_inode != dir); 5594260f7c7SSage Weil audit_inode_child(victim, dir); 5604260f7c7SSage Weil 5614260f7c7SSage Weil error = inode_permission(dir, MAY_WRITE | MAY_EXEC); 5624260f7c7SSage Weil if (error) 5634260f7c7SSage Weil return error; 5644260f7c7SSage Weil if (IS_APPEND(dir)) 5654260f7c7SSage Weil return -EPERM; 5664260f7c7SSage Weil if (btrfs_check_sticky(dir, victim->d_inode)|| 5674260f7c7SSage Weil IS_APPEND(victim->d_inode)|| 5684260f7c7SSage Weil IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode)) 5694260f7c7SSage Weil return -EPERM; 5704260f7c7SSage Weil if (isdir) { 5714260f7c7SSage Weil if (!S_ISDIR(victim->d_inode->i_mode)) 5724260f7c7SSage Weil return -ENOTDIR; 5734260f7c7SSage Weil if (IS_ROOT(victim)) 5744260f7c7SSage Weil return -EBUSY; 5754260f7c7SSage Weil } else if (S_ISDIR(victim->d_inode->i_mode)) 5764260f7c7SSage Weil return -EISDIR; 5774260f7c7SSage Weil if (IS_DEADDIR(dir)) 5784260f7c7SSage Weil return -ENOENT; 5794260f7c7SSage Weil if (victim->d_flags & DCACHE_NFSFS_RENAMED) 5804260f7c7SSage Weil return -EBUSY; 5814260f7c7SSage Weil return 0; 5824260f7c7SSage Weil } 5834260f7c7SSage Weil 584cb8e7090SChristoph Hellwig /* copy of may_create in fs/namei.c() */ 585cb8e7090SChristoph Hellwig static inline int btrfs_may_create(struct inode *dir, struct dentry *child) 586cb8e7090SChristoph Hellwig { 587cb8e7090SChristoph Hellwig if (child->d_inode) 588cb8e7090SChristoph Hellwig return -EEXIST; 589cb8e7090SChristoph Hellwig if (IS_DEADDIR(dir)) 590cb8e7090SChristoph Hellwig return -ENOENT; 591cb8e7090SChristoph Hellwig return inode_permission(dir, MAY_WRITE | MAY_EXEC); 592cb8e7090SChristoph Hellwig } 593cb8e7090SChristoph Hellwig 594cb8e7090SChristoph Hellwig /* 595cb8e7090SChristoph Hellwig * Create a new subvolume below @parent. This is largely modeled after 596cb8e7090SChristoph Hellwig * sys_mkdirat and vfs_mkdir, but we only do a single component lookup 597cb8e7090SChristoph Hellwig * inside this filesystem so it's quite a bit simpler. 598cb8e7090SChristoph Hellwig */ 59976dda93cSYan, Zheng static noinline int btrfs_mksubvol(struct path *parent, 60076dda93cSYan, Zheng char *name, int namelen, 60172fd032eSSage Weil struct btrfs_root *snap_src, 602b83cc969SLi Zefan u64 *async_transid, bool readonly) 603cb8e7090SChristoph Hellwig { 60476dda93cSYan, Zheng struct inode *dir = parent->dentry->d_inode; 605cb8e7090SChristoph Hellwig struct dentry *dentry; 606cb8e7090SChristoph Hellwig int error; 607cb8e7090SChristoph Hellwig 60876dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 609cb8e7090SChristoph Hellwig 610cb8e7090SChristoph Hellwig dentry = lookup_one_len(name, parent->dentry, namelen); 611cb8e7090SChristoph Hellwig error = PTR_ERR(dentry); 612cb8e7090SChristoph Hellwig if (IS_ERR(dentry)) 613cb8e7090SChristoph Hellwig goto out_unlock; 614cb8e7090SChristoph Hellwig 615cb8e7090SChristoph Hellwig error = -EEXIST; 616cb8e7090SChristoph Hellwig if (dentry->d_inode) 617cb8e7090SChristoph Hellwig goto out_dput; 618cb8e7090SChristoph Hellwig 619cb8e7090SChristoph Hellwig error = mnt_want_write(parent->mnt); 620cb8e7090SChristoph Hellwig if (error) 621cb8e7090SChristoph Hellwig goto out_dput; 622cb8e7090SChristoph Hellwig 62376dda93cSYan, Zheng error = btrfs_may_create(dir, dentry); 624cb8e7090SChristoph Hellwig if (error) 625cb8e7090SChristoph Hellwig goto out_drop_write; 626cb8e7090SChristoph Hellwig 62776dda93cSYan, Zheng down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 62876dda93cSYan, Zheng 62976dda93cSYan, Zheng if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) 63076dda93cSYan, Zheng goto out_up_read; 63176dda93cSYan, Zheng 6323de4586cSChris Mason if (snap_src) { 63372fd032eSSage Weil error = create_snapshot(snap_src, dentry, 634b83cc969SLi Zefan name, namelen, async_transid, readonly); 6353de4586cSChris Mason } else { 63676dda93cSYan, Zheng error = create_subvol(BTRFS_I(dir)->root, dentry, 63772fd032eSSage Weil name, namelen, async_transid); 6383de4586cSChris Mason } 63976dda93cSYan, Zheng if (!error) 64076dda93cSYan, Zheng fsnotify_mkdir(dir, dentry); 64176dda93cSYan, Zheng out_up_read: 64276dda93cSYan, Zheng up_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); 643cb8e7090SChristoph Hellwig out_drop_write: 644cb8e7090SChristoph Hellwig mnt_drop_write(parent->mnt); 645cb8e7090SChristoph Hellwig out_dput: 646cb8e7090SChristoph Hellwig dput(dentry); 647cb8e7090SChristoph Hellwig out_unlock: 64876dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 649cb8e7090SChristoph Hellwig return error; 650cb8e7090SChristoph Hellwig } 651cb8e7090SChristoph Hellwig 652940100a4SChris Mason static int should_defrag_range(struct inode *inode, u64 start, u64 len, 6531e701a32SChris Mason int thresh, u64 *last_len, u64 *skip, 6541e701a32SChris Mason u64 *defrag_end) 655940100a4SChris Mason { 656940100a4SChris Mason struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 657940100a4SChris Mason struct extent_map *em = NULL; 658940100a4SChris Mason struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; 659940100a4SChris Mason int ret = 1; 660940100a4SChris Mason 6611e701a32SChris Mason 6621e701a32SChris Mason if (thresh == 0) 6631e701a32SChris Mason thresh = 256 * 1024; 6641e701a32SChris Mason 665940100a4SChris Mason /* 666940100a4SChris Mason * make sure that once we start defragging and extent, we keep on 667940100a4SChris Mason * defragging it 668940100a4SChris Mason */ 669940100a4SChris Mason if (start < *defrag_end) 670940100a4SChris Mason return 1; 671940100a4SChris Mason 672940100a4SChris Mason *skip = 0; 673940100a4SChris Mason 674940100a4SChris Mason /* 675940100a4SChris Mason * hopefully we have this extent in the tree already, try without 676940100a4SChris Mason * the full extent lock 677940100a4SChris Mason */ 678940100a4SChris Mason read_lock(&em_tree->lock); 679940100a4SChris Mason em = lookup_extent_mapping(em_tree, start, len); 680940100a4SChris Mason read_unlock(&em_tree->lock); 681940100a4SChris Mason 682940100a4SChris Mason if (!em) { 683940100a4SChris Mason /* get the big lock and read metadata off disk */ 684940100a4SChris Mason lock_extent(io_tree, start, start + len - 1, GFP_NOFS); 685940100a4SChris Mason em = btrfs_get_extent(inode, NULL, 0, start, len, 0); 686940100a4SChris Mason unlock_extent(io_tree, start, start + len - 1, GFP_NOFS); 687940100a4SChris Mason 6886cf8bfbfSDan Carpenter if (IS_ERR(em)) 689940100a4SChris Mason return 0; 690940100a4SChris Mason } 691940100a4SChris Mason 692940100a4SChris Mason /* this will cover holes, and inline extents */ 693940100a4SChris Mason if (em->block_start >= EXTENT_MAP_LAST_BYTE) 694940100a4SChris Mason ret = 0; 695940100a4SChris Mason 696940100a4SChris Mason /* 697940100a4SChris Mason * we hit a real extent, if it is big don't bother defragging it again 698940100a4SChris Mason */ 6991e701a32SChris Mason if ((*last_len == 0 || *last_len >= thresh) && em->len >= thresh) 700940100a4SChris Mason ret = 0; 701940100a4SChris Mason 702940100a4SChris Mason /* 703940100a4SChris Mason * last_len ends up being a counter of how many bytes we've defragged. 704940100a4SChris Mason * every time we choose not to defrag an extent, we reset *last_len 705940100a4SChris Mason * so that the next tiny extent will force a defrag. 706940100a4SChris Mason * 707940100a4SChris Mason * The end result of this is that tiny extents before a single big 708940100a4SChris Mason * extent will force at least part of that big extent to be defragged. 709940100a4SChris Mason */ 710940100a4SChris Mason if (ret) { 711940100a4SChris Mason *last_len += len; 712940100a4SChris Mason *defrag_end = extent_map_end(em); 713940100a4SChris Mason } else { 714940100a4SChris Mason *last_len = 0; 715940100a4SChris Mason *skip = extent_map_end(em); 716940100a4SChris Mason *defrag_end = 0; 717940100a4SChris Mason } 718940100a4SChris Mason 719940100a4SChris Mason free_extent_map(em); 720940100a4SChris Mason return ret; 721940100a4SChris Mason } 722940100a4SChris Mason 7231e701a32SChris Mason static int btrfs_defrag_file(struct file *file, 7241e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range) 725f46b5a66SChristoph Hellwig { 726f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 727f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 728f46b5a66SChristoph Hellwig struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; 7293eaa2885SChris Mason struct btrfs_ordered_extent *ordered; 730f46b5a66SChristoph Hellwig struct page *page; 7311a419d85SLi Zefan struct btrfs_super_block *disk_super; 732f46b5a66SChristoph Hellwig unsigned long last_index; 733f46b5a66SChristoph Hellwig unsigned long ra_pages = root->fs_info->bdi.ra_pages; 734f46b5a66SChristoph Hellwig unsigned long total_read = 0; 7351a419d85SLi Zefan u64 features; 736f46b5a66SChristoph Hellwig u64 page_start; 737f46b5a66SChristoph Hellwig u64 page_end; 738940100a4SChris Mason u64 last_len = 0; 739940100a4SChris Mason u64 skip = 0; 740940100a4SChris Mason u64 defrag_end = 0; 741f46b5a66SChristoph Hellwig unsigned long i; 742f46b5a66SChristoph Hellwig int ret; 7431a419d85SLi Zefan int compress_type = BTRFS_COMPRESS_ZLIB; 7441a419d85SLi Zefan 7451a419d85SLi Zefan if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) { 7461a419d85SLi Zefan if (range->compress_type > BTRFS_COMPRESS_TYPES) 7471a419d85SLi Zefan return -EINVAL; 7481a419d85SLi Zefan if (range->compress_type) 7491a419d85SLi Zefan compress_type = range->compress_type; 7501a419d85SLi Zefan } 751f46b5a66SChristoph Hellwig 752940100a4SChris Mason if (inode->i_size == 0) 753940100a4SChris Mason return 0; 754f46b5a66SChristoph Hellwig 7551e701a32SChris Mason if (range->start + range->len > range->start) { 7561e701a32SChris Mason last_index = min_t(u64, inode->i_size - 1, 7571e701a32SChris Mason range->start + range->len - 1) >> PAGE_CACHE_SHIFT; 7581e701a32SChris Mason } else { 759940100a4SChris Mason last_index = (inode->i_size - 1) >> PAGE_CACHE_SHIFT; 7601e701a32SChris Mason } 7611e701a32SChris Mason 7621e701a32SChris Mason i = range->start >> PAGE_CACHE_SHIFT; 763940100a4SChris Mason while (i <= last_index) { 764940100a4SChris Mason if (!should_defrag_range(inode, (u64)i << PAGE_CACHE_SHIFT, 7651e701a32SChris Mason PAGE_CACHE_SIZE, 7661e701a32SChris Mason range->extent_thresh, 7671e701a32SChris Mason &last_len, &skip, 768940100a4SChris Mason &defrag_end)) { 769940100a4SChris Mason unsigned long next; 770940100a4SChris Mason /* 771940100a4SChris Mason * the should_defrag function tells us how much to skip 772940100a4SChris Mason * bump our counter by the suggested amount 773940100a4SChris Mason */ 774940100a4SChris Mason next = (skip + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; 775940100a4SChris Mason i = max(i + 1, next); 776940100a4SChris Mason continue; 777940100a4SChris Mason } 778940100a4SChris Mason 779f46b5a66SChristoph Hellwig if (total_read % ra_pages == 0) { 780f46b5a66SChristoph Hellwig btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, 781f46b5a66SChristoph Hellwig min(last_index, i + ra_pages - 1)); 782f46b5a66SChristoph Hellwig } 783f46b5a66SChristoph Hellwig total_read++; 784940100a4SChris Mason mutex_lock(&inode->i_mutex); 7851e701a32SChris Mason if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) 7861a419d85SLi Zefan BTRFS_I(inode)->force_compress = compress_type; 787940100a4SChris Mason 7880ca1f7ceSYan, Zheng ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); 7890ca1f7ceSYan, Zheng if (ret) 7900ca1f7ceSYan, Zheng goto err_unlock; 7913eaa2885SChris Mason again: 792940100a4SChris Mason if (inode->i_size == 0 || 793940100a4SChris Mason i > ((inode->i_size - 1) >> PAGE_CACHE_SHIFT)) { 794940100a4SChris Mason ret = 0; 795940100a4SChris Mason goto err_reservations; 796940100a4SChris Mason } 797940100a4SChris Mason 798f46b5a66SChristoph Hellwig page = grab_cache_page(inode->i_mapping, i); 7990ca1f7ceSYan, Zheng if (!page) { 8000ca1f7ceSYan, Zheng ret = -ENOMEM; 801940100a4SChris Mason goto err_reservations; 8020ca1f7ceSYan, Zheng } 803940100a4SChris Mason 804f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 805f46b5a66SChristoph Hellwig btrfs_readpage(NULL, page); 806f46b5a66SChristoph Hellwig lock_page(page); 807f46b5a66SChristoph Hellwig if (!PageUptodate(page)) { 808f46b5a66SChristoph Hellwig unlock_page(page); 809f46b5a66SChristoph Hellwig page_cache_release(page); 8100ca1f7ceSYan, Zheng ret = -EIO; 811940100a4SChris Mason goto err_reservations; 812f46b5a66SChristoph Hellwig } 813f46b5a66SChristoph Hellwig } 814f46b5a66SChristoph Hellwig 815940100a4SChris Mason if (page->mapping != inode->i_mapping) { 816940100a4SChris Mason unlock_page(page); 817940100a4SChris Mason page_cache_release(page); 818940100a4SChris Mason goto again; 819940100a4SChris Mason } 820940100a4SChris Mason 821f46b5a66SChristoph Hellwig wait_on_page_writeback(page); 822f46b5a66SChristoph Hellwig 823940100a4SChris Mason if (PageDirty(page)) { 8240ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 825940100a4SChris Mason goto loop_unlock; 826940100a4SChris Mason } 827940100a4SChris Mason 828f46b5a66SChristoph Hellwig page_start = (u64)page->index << PAGE_CACHE_SHIFT; 829f46b5a66SChristoph Hellwig page_end = page_start + PAGE_CACHE_SIZE - 1; 830f46b5a66SChristoph Hellwig lock_extent(io_tree, page_start, page_end, GFP_NOFS); 8313eaa2885SChris Mason 8323eaa2885SChris Mason ordered = btrfs_lookup_ordered_extent(inode, page_start); 8333eaa2885SChris Mason if (ordered) { 8343eaa2885SChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 8353eaa2885SChris Mason unlock_page(page); 8363eaa2885SChris Mason page_cache_release(page); 8373eaa2885SChris Mason btrfs_start_ordered_extent(inode, ordered, 1); 8383eaa2885SChris Mason btrfs_put_ordered_extent(ordered); 8393eaa2885SChris Mason goto again; 8403eaa2885SChris Mason } 8413eaa2885SChris Mason set_page_extent_mapped(page); 8423eaa2885SChris Mason 843f87f057bSChris Mason /* 844f87f057bSChris Mason * this makes sure page_mkwrite is called on the 845f87f057bSChris Mason * page if it is dirtied again later 846f87f057bSChris Mason */ 847f87f057bSChris Mason clear_page_dirty_for_io(page); 848940100a4SChris Mason clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, 849940100a4SChris Mason page_end, EXTENT_DIRTY | EXTENT_DELALLOC | 850940100a4SChris Mason EXTENT_DO_ACCOUNTING, GFP_NOFS); 851f87f057bSChris Mason 8522ac55d41SJosef Bacik btrfs_set_extent_delalloc(inode, page_start, page_end, NULL); 853940100a4SChris Mason ClearPageChecked(page); 854f46b5a66SChristoph Hellwig set_page_dirty(page); 855a1ed835eSChris Mason unlock_extent(io_tree, page_start, page_end, GFP_NOFS); 856940100a4SChris Mason 857940100a4SChris Mason loop_unlock: 858f46b5a66SChristoph Hellwig unlock_page(page); 859f46b5a66SChristoph Hellwig page_cache_release(page); 860940100a4SChris Mason mutex_unlock(&inode->i_mutex); 861940100a4SChris Mason 862f46b5a66SChristoph Hellwig balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); 863940100a4SChris Mason i++; 864f46b5a66SChristoph Hellwig } 865f46b5a66SChristoph Hellwig 8661e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_START_IO)) 8671e701a32SChris Mason filemap_flush(inode->i_mapping); 8681e701a32SChris Mason 8691e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 8701e701a32SChris Mason /* the filemap_flush will queue IO into the worker threads, but 8711e701a32SChris Mason * we have to make sure the IO is actually started and that 8721e701a32SChris Mason * ordered extents get created before we return 8731e701a32SChris Mason */ 8741e701a32SChris Mason atomic_inc(&root->fs_info->async_submit_draining); 8751e701a32SChris Mason while (atomic_read(&root->fs_info->nr_async_submits) || 8761e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages)) { 8771e701a32SChris Mason wait_event(root->fs_info->async_submit_wait, 8781e701a32SChris Mason (atomic_read(&root->fs_info->nr_async_submits) == 0 && 8791e701a32SChris Mason atomic_read(&root->fs_info->async_delalloc_pages) == 0)); 8801e701a32SChris Mason } 8811e701a32SChris Mason atomic_dec(&root->fs_info->async_submit_draining); 8821e701a32SChris Mason 8831e701a32SChris Mason mutex_lock(&inode->i_mutex); 884261507a0SLi Zefan BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE; 8851e701a32SChris Mason mutex_unlock(&inode->i_mutex); 8861e701a32SChris Mason } 8871e701a32SChris Mason 8881a419d85SLi Zefan disk_super = &root->fs_info->super_copy; 8891a419d85SLi Zefan features = btrfs_super_incompat_flags(disk_super); 8901a419d85SLi Zefan if (range->compress_type == BTRFS_COMPRESS_LZO) { 8911a419d85SLi Zefan features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; 8921a419d85SLi Zefan btrfs_set_super_incompat_flags(disk_super, features); 8931a419d85SLi Zefan } 8941a419d85SLi Zefan 895f46b5a66SChristoph Hellwig return 0; 896940100a4SChris Mason 897940100a4SChris Mason err_reservations: 8980ca1f7ceSYan, Zheng btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); 8990ca1f7ceSYan, Zheng err_unlock: 900940100a4SChris Mason mutex_unlock(&inode->i_mutex); 901940100a4SChris Mason return ret; 902f46b5a66SChristoph Hellwig } 903f46b5a66SChristoph Hellwig 90476dda93cSYan, Zheng static noinline int btrfs_ioctl_resize(struct btrfs_root *root, 90576dda93cSYan, Zheng void __user *arg) 906f46b5a66SChristoph Hellwig { 907f46b5a66SChristoph Hellwig u64 new_size; 908f46b5a66SChristoph Hellwig u64 old_size; 909f46b5a66SChristoph Hellwig u64 devid = 1; 910f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 911f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 912f46b5a66SChristoph Hellwig struct btrfs_device *device = NULL; 913f46b5a66SChristoph Hellwig char *sizestr; 914f46b5a66SChristoph Hellwig char *devstr = NULL; 915f46b5a66SChristoph Hellwig int ret = 0; 916f46b5a66SChristoph Hellwig int mod = 0; 917f46b5a66SChristoph Hellwig 918c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 919c146afadSYan Zheng return -EROFS; 920c146afadSYan Zheng 921e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 922e441d54dSChris Mason return -EPERM; 923e441d54dSChris Mason 924dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 925dae7b665SLi Zefan if (IS_ERR(vol_args)) 926dae7b665SLi Zefan return PTR_ERR(vol_args); 9275516e595SMark Fasheh 9285516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 929f46b5a66SChristoph Hellwig 9307d9eb12cSChris Mason mutex_lock(&root->fs_info->volume_mutex); 931f46b5a66SChristoph Hellwig sizestr = vol_args->name; 932f46b5a66SChristoph Hellwig devstr = strchr(sizestr, ':'); 933f46b5a66SChristoph Hellwig if (devstr) { 934f46b5a66SChristoph Hellwig char *end; 935f46b5a66SChristoph Hellwig sizestr = devstr + 1; 936f46b5a66SChristoph Hellwig *devstr = '\0'; 937f46b5a66SChristoph Hellwig devstr = vol_args->name; 938f46b5a66SChristoph Hellwig devid = simple_strtoull(devstr, &end, 10); 93921380931SJoel Becker printk(KERN_INFO "resizing devid %llu\n", 94021380931SJoel Becker (unsigned long long)devid); 941f46b5a66SChristoph Hellwig } 9422b82032cSYan Zheng device = btrfs_find_device(root, devid, NULL, NULL); 943f46b5a66SChristoph Hellwig if (!device) { 94421380931SJoel Becker printk(KERN_INFO "resizer unable to find device %llu\n", 94521380931SJoel Becker (unsigned long long)devid); 946f46b5a66SChristoph Hellwig ret = -EINVAL; 947f46b5a66SChristoph Hellwig goto out_unlock; 948f46b5a66SChristoph Hellwig } 949f46b5a66SChristoph Hellwig if (!strcmp(sizestr, "max")) 950f46b5a66SChristoph Hellwig new_size = device->bdev->bd_inode->i_size; 951f46b5a66SChristoph Hellwig else { 952f46b5a66SChristoph Hellwig if (sizestr[0] == '-') { 953f46b5a66SChristoph Hellwig mod = -1; 954f46b5a66SChristoph Hellwig sizestr++; 955f46b5a66SChristoph Hellwig } else if (sizestr[0] == '+') { 956f46b5a66SChristoph Hellwig mod = 1; 957f46b5a66SChristoph Hellwig sizestr++; 958f46b5a66SChristoph Hellwig } 95991748467SAkinobu Mita new_size = memparse(sizestr, NULL); 960f46b5a66SChristoph Hellwig if (new_size == 0) { 961f46b5a66SChristoph Hellwig ret = -EINVAL; 962f46b5a66SChristoph Hellwig goto out_unlock; 963f46b5a66SChristoph Hellwig } 964f46b5a66SChristoph Hellwig } 965f46b5a66SChristoph Hellwig 966f46b5a66SChristoph Hellwig old_size = device->total_bytes; 967f46b5a66SChristoph Hellwig 968f46b5a66SChristoph Hellwig if (mod < 0) { 969f46b5a66SChristoph Hellwig if (new_size > old_size) { 970f46b5a66SChristoph Hellwig ret = -EINVAL; 971f46b5a66SChristoph Hellwig goto out_unlock; 972f46b5a66SChristoph Hellwig } 973f46b5a66SChristoph Hellwig new_size = old_size - new_size; 974f46b5a66SChristoph Hellwig } else if (mod > 0) { 975f46b5a66SChristoph Hellwig new_size = old_size + new_size; 976f46b5a66SChristoph Hellwig } 977f46b5a66SChristoph Hellwig 978f46b5a66SChristoph Hellwig if (new_size < 256 * 1024 * 1024) { 979f46b5a66SChristoph Hellwig ret = -EINVAL; 980f46b5a66SChristoph Hellwig goto out_unlock; 981f46b5a66SChristoph Hellwig } 982f46b5a66SChristoph Hellwig if (new_size > device->bdev->bd_inode->i_size) { 983f46b5a66SChristoph Hellwig ret = -EFBIG; 984f46b5a66SChristoph Hellwig goto out_unlock; 985f46b5a66SChristoph Hellwig } 986f46b5a66SChristoph Hellwig 987f46b5a66SChristoph Hellwig do_div(new_size, root->sectorsize); 988f46b5a66SChristoph Hellwig new_size *= root->sectorsize; 989f46b5a66SChristoph Hellwig 990f46b5a66SChristoph Hellwig printk(KERN_INFO "new size for %s is %llu\n", 991f46b5a66SChristoph Hellwig device->name, (unsigned long long)new_size); 992f46b5a66SChristoph Hellwig 993f46b5a66SChristoph Hellwig if (new_size > old_size) { 994a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 99598d5dc13STsutomu Itoh if (IS_ERR(trans)) { 99698d5dc13STsutomu Itoh ret = PTR_ERR(trans); 99798d5dc13STsutomu Itoh goto out_unlock; 99898d5dc13STsutomu Itoh } 999f46b5a66SChristoph Hellwig ret = btrfs_grow_device(trans, device, new_size); 1000f46b5a66SChristoph Hellwig btrfs_commit_transaction(trans, root); 1001f46b5a66SChristoph Hellwig } else { 1002f46b5a66SChristoph Hellwig ret = btrfs_shrink_device(device, new_size); 1003f46b5a66SChristoph Hellwig } 1004f46b5a66SChristoph Hellwig 1005f46b5a66SChristoph Hellwig out_unlock: 10067d9eb12cSChris Mason mutex_unlock(&root->fs_info->volume_mutex); 1007f46b5a66SChristoph Hellwig kfree(vol_args); 1008f46b5a66SChristoph Hellwig return ret; 1009f46b5a66SChristoph Hellwig } 1010f46b5a66SChristoph Hellwig 101172fd032eSSage Weil static noinline int btrfs_ioctl_snap_create_transid(struct file *file, 101272fd032eSSage Weil char *name, 101372fd032eSSage Weil unsigned long fd, 101472fd032eSSage Weil int subvol, 1015b83cc969SLi Zefan u64 *transid, 1016b83cc969SLi Zefan bool readonly) 1017f46b5a66SChristoph Hellwig { 1018cb8e7090SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 10193de4586cSChris Mason struct file *src_file; 1020f46b5a66SChristoph Hellwig int namelen; 10213de4586cSChris Mason int ret = 0; 1022f46b5a66SChristoph Hellwig 1023c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1024c146afadSYan Zheng return -EROFS; 1025c146afadSYan Zheng 102672fd032eSSage Weil namelen = strlen(name); 102772fd032eSSage Weil if (strchr(name, '/')) { 1028f46b5a66SChristoph Hellwig ret = -EINVAL; 1029f46b5a66SChristoph Hellwig goto out; 1030f46b5a66SChristoph Hellwig } 1031f46b5a66SChristoph Hellwig 10323de4586cSChris Mason if (subvol) { 103372fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 1034b83cc969SLi Zefan NULL, transid, readonly); 1035cb8e7090SChristoph Hellwig } else { 10363de4586cSChris Mason struct inode *src_inode; 103772fd032eSSage Weil src_file = fget(fd); 10383de4586cSChris Mason if (!src_file) { 10393de4586cSChris Mason ret = -EINVAL; 10403de4586cSChris Mason goto out; 10413de4586cSChris Mason } 10423de4586cSChris Mason 10433de4586cSChris Mason src_inode = src_file->f_path.dentry->d_inode; 10443de4586cSChris Mason if (src_inode->i_sb != file->f_path.dentry->d_inode->i_sb) { 1045d397712bSChris Mason printk(KERN_INFO "btrfs: Snapshot src from " 1046d397712bSChris Mason "another FS\n"); 10473de4586cSChris Mason ret = -EINVAL; 10483de4586cSChris Mason fput(src_file); 10493de4586cSChris Mason goto out; 10503de4586cSChris Mason } 105172fd032eSSage Weil ret = btrfs_mksubvol(&file->f_path, name, namelen, 105272fd032eSSage Weil BTRFS_I(src_inode)->root, 1053b83cc969SLi Zefan transid, readonly); 10543de4586cSChris Mason fput(src_file); 1055cb8e7090SChristoph Hellwig } 1056f46b5a66SChristoph Hellwig out: 105772fd032eSSage Weil return ret; 105872fd032eSSage Weil } 105972fd032eSSage Weil 106072fd032eSSage Weil static noinline int btrfs_ioctl_snap_create(struct file *file, 1061fa0d2b9bSLi Zefan void __user *arg, int subvol) 106272fd032eSSage Weil { 1063fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args *vol_args; 106472fd032eSSage Weil int ret; 106572fd032eSSage Weil 1066fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1067fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1068fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1069fa0d2b9bSLi Zefan vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1070fa0d2b9bSLi Zefan 1071fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1072b83cc969SLi Zefan vol_args->fd, subvol, 1073b83cc969SLi Zefan NULL, false); 1074fa0d2b9bSLi Zefan 1075fa0d2b9bSLi Zefan kfree(vol_args); 1076fa0d2b9bSLi Zefan return ret; 1077fa0d2b9bSLi Zefan } 1078fa0d2b9bSLi Zefan 1079fa0d2b9bSLi Zefan static noinline int btrfs_ioctl_snap_create_v2(struct file *file, 1080fa0d2b9bSLi Zefan void __user *arg, int subvol) 1081fa0d2b9bSLi Zefan { 1082fa0d2b9bSLi Zefan struct btrfs_ioctl_vol_args_v2 *vol_args; 1083fa0d2b9bSLi Zefan int ret; 1084fdfb1e4fSLi Zefan u64 transid = 0; 1085fdfb1e4fSLi Zefan u64 *ptr = NULL; 1086b83cc969SLi Zefan bool readonly = false; 108772fd032eSSage Weil 1088fa0d2b9bSLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1089fa0d2b9bSLi Zefan if (IS_ERR(vol_args)) 1090fa0d2b9bSLi Zefan return PTR_ERR(vol_args); 1091fa0d2b9bSLi Zefan vol_args->name[BTRFS_SUBVOL_NAME_MAX] = '\0'; 1092fdfb1e4fSLi Zefan 1093b83cc969SLi Zefan if (vol_args->flags & 1094b83cc969SLi Zefan ~(BTRFS_SUBVOL_CREATE_ASYNC | BTRFS_SUBVOL_RDONLY)) { 1095b83cc969SLi Zefan ret = -EOPNOTSUPP; 1096fdfb1e4fSLi Zefan goto out; 1097fdfb1e4fSLi Zefan } 1098fdfb1e4fSLi Zefan 1099fa0d2b9bSLi Zefan if (vol_args->flags & BTRFS_SUBVOL_CREATE_ASYNC) 1100fdfb1e4fSLi Zefan ptr = &transid; 1101b83cc969SLi Zefan if (vol_args->flags & BTRFS_SUBVOL_RDONLY) 1102b83cc969SLi Zefan readonly = true; 110375eaa0e2SSage Weil 1104fa0d2b9bSLi Zefan ret = btrfs_ioctl_snap_create_transid(file, vol_args->name, 1105b83cc969SLi Zefan vol_args->fd, subvol, 1106b83cc969SLi Zefan ptr, readonly); 110775eaa0e2SSage Weil 1108fdfb1e4fSLi Zefan if (ret == 0 && ptr && 110975eaa0e2SSage Weil copy_to_user(arg + 1110fdfb1e4fSLi Zefan offsetof(struct btrfs_ioctl_vol_args_v2, 1111fdfb1e4fSLi Zefan transid), ptr, sizeof(*ptr))) 111275eaa0e2SSage Weil ret = -EFAULT; 1113fdfb1e4fSLi Zefan out: 1114f46b5a66SChristoph Hellwig kfree(vol_args); 1115f46b5a66SChristoph Hellwig return ret; 1116f46b5a66SChristoph Hellwig } 1117f46b5a66SChristoph Hellwig 11180caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_getflags(struct file *file, 11190caa102dSLi Zefan void __user *arg) 11200caa102dSLi Zefan { 11210caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 11220caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 11230caa102dSLi Zefan int ret = 0; 11240caa102dSLi Zefan u64 flags = 0; 11250caa102dSLi Zefan 11260caa102dSLi Zefan if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) 11270caa102dSLi Zefan return -EINVAL; 11280caa102dSLi Zefan 11290caa102dSLi Zefan down_read(&root->fs_info->subvol_sem); 11300caa102dSLi Zefan if (btrfs_root_readonly(root)) 11310caa102dSLi Zefan flags |= BTRFS_SUBVOL_RDONLY; 11320caa102dSLi Zefan up_read(&root->fs_info->subvol_sem); 11330caa102dSLi Zefan 11340caa102dSLi Zefan if (copy_to_user(arg, &flags, sizeof(flags))) 11350caa102dSLi Zefan ret = -EFAULT; 11360caa102dSLi Zefan 11370caa102dSLi Zefan return ret; 11380caa102dSLi Zefan } 11390caa102dSLi Zefan 11400caa102dSLi Zefan static noinline int btrfs_ioctl_subvol_setflags(struct file *file, 11410caa102dSLi Zefan void __user *arg) 11420caa102dSLi Zefan { 11430caa102dSLi Zefan struct inode *inode = fdentry(file)->d_inode; 11440caa102dSLi Zefan struct btrfs_root *root = BTRFS_I(inode)->root; 11450caa102dSLi Zefan struct btrfs_trans_handle *trans; 11460caa102dSLi Zefan u64 root_flags; 11470caa102dSLi Zefan u64 flags; 11480caa102dSLi Zefan int ret = 0; 11490caa102dSLi Zefan 11500caa102dSLi Zefan if (root->fs_info->sb->s_flags & MS_RDONLY) 11510caa102dSLi Zefan return -EROFS; 11520caa102dSLi Zefan 11530caa102dSLi Zefan if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) 11540caa102dSLi Zefan return -EINVAL; 11550caa102dSLi Zefan 11560caa102dSLi Zefan if (copy_from_user(&flags, arg, sizeof(flags))) 11570caa102dSLi Zefan return -EFAULT; 11580caa102dSLi Zefan 1159b4dc2b8cSLi Zefan if (flags & BTRFS_SUBVOL_CREATE_ASYNC) 11600caa102dSLi Zefan return -EINVAL; 11610caa102dSLi Zefan 11620caa102dSLi Zefan if (flags & ~BTRFS_SUBVOL_RDONLY) 11630caa102dSLi Zefan return -EOPNOTSUPP; 11640caa102dSLi Zefan 1165b4dc2b8cSLi Zefan if (!is_owner_or_cap(inode)) 1166b4dc2b8cSLi Zefan return -EACCES; 1167b4dc2b8cSLi Zefan 11680caa102dSLi Zefan down_write(&root->fs_info->subvol_sem); 11690caa102dSLi Zefan 11700caa102dSLi Zefan /* nothing to do */ 11710caa102dSLi Zefan if (!!(flags & BTRFS_SUBVOL_RDONLY) == btrfs_root_readonly(root)) 11720caa102dSLi Zefan goto out; 11730caa102dSLi Zefan 11740caa102dSLi Zefan root_flags = btrfs_root_flags(&root->root_item); 11750caa102dSLi Zefan if (flags & BTRFS_SUBVOL_RDONLY) 11760caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 11770caa102dSLi Zefan root_flags | BTRFS_ROOT_SUBVOL_RDONLY); 11780caa102dSLi Zefan else 11790caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, 11800caa102dSLi Zefan root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY); 11810caa102dSLi Zefan 11820caa102dSLi Zefan trans = btrfs_start_transaction(root, 1); 11830caa102dSLi Zefan if (IS_ERR(trans)) { 11840caa102dSLi Zefan ret = PTR_ERR(trans); 11850caa102dSLi Zefan goto out_reset; 11860caa102dSLi Zefan } 11870caa102dSLi Zefan 1188b4dc2b8cSLi Zefan ret = btrfs_update_root(trans, root->fs_info->tree_root, 11890caa102dSLi Zefan &root->root_key, &root->root_item); 11900caa102dSLi Zefan 11910caa102dSLi Zefan btrfs_commit_transaction(trans, root); 11920caa102dSLi Zefan out_reset: 11930caa102dSLi Zefan if (ret) 11940caa102dSLi Zefan btrfs_set_root_flags(&root->root_item, root_flags); 11950caa102dSLi Zefan out: 11960caa102dSLi Zefan up_write(&root->fs_info->subvol_sem); 11970caa102dSLi Zefan return ret; 11980caa102dSLi Zefan } 11990caa102dSLi Zefan 120076dda93cSYan, Zheng /* 120176dda93cSYan, Zheng * helper to check if the subvolume references other subvolumes 120276dda93cSYan, Zheng */ 120376dda93cSYan, Zheng static noinline int may_destroy_subvol(struct btrfs_root *root) 120476dda93cSYan, Zheng { 120576dda93cSYan, Zheng struct btrfs_path *path; 120676dda93cSYan, Zheng struct btrfs_key key; 120776dda93cSYan, Zheng int ret; 120876dda93cSYan, Zheng 120976dda93cSYan, Zheng path = btrfs_alloc_path(); 121076dda93cSYan, Zheng if (!path) 121176dda93cSYan, Zheng return -ENOMEM; 121276dda93cSYan, Zheng 121376dda93cSYan, Zheng key.objectid = root->root_key.objectid; 121476dda93cSYan, Zheng key.type = BTRFS_ROOT_REF_KEY; 121576dda93cSYan, Zheng key.offset = (u64)-1; 121676dda93cSYan, Zheng 121776dda93cSYan, Zheng ret = btrfs_search_slot(NULL, root->fs_info->tree_root, 121876dda93cSYan, Zheng &key, path, 0, 0); 121976dda93cSYan, Zheng if (ret < 0) 122076dda93cSYan, Zheng goto out; 122176dda93cSYan, Zheng BUG_ON(ret == 0); 122276dda93cSYan, Zheng 122376dda93cSYan, Zheng ret = 0; 122476dda93cSYan, Zheng if (path->slots[0] > 0) { 122576dda93cSYan, Zheng path->slots[0]--; 122676dda93cSYan, Zheng btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); 122776dda93cSYan, Zheng if (key.objectid == root->root_key.objectid && 122876dda93cSYan, Zheng key.type == BTRFS_ROOT_REF_KEY) 122976dda93cSYan, Zheng ret = -ENOTEMPTY; 123076dda93cSYan, Zheng } 123176dda93cSYan, Zheng out: 123276dda93cSYan, Zheng btrfs_free_path(path); 123376dda93cSYan, Zheng return ret; 123476dda93cSYan, Zheng } 123576dda93cSYan, Zheng 1236ac8e9819SChris Mason static noinline int key_in_sk(struct btrfs_key *key, 1237ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk) 1238ac8e9819SChris Mason { 1239abc6e134SChris Mason struct btrfs_key test; 1240abc6e134SChris Mason int ret; 1241abc6e134SChris Mason 1242abc6e134SChris Mason test.objectid = sk->min_objectid; 1243abc6e134SChris Mason test.type = sk->min_type; 1244abc6e134SChris Mason test.offset = sk->min_offset; 1245abc6e134SChris Mason 1246abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1247abc6e134SChris Mason if (ret < 0) 1248ac8e9819SChris Mason return 0; 1249abc6e134SChris Mason 1250abc6e134SChris Mason test.objectid = sk->max_objectid; 1251abc6e134SChris Mason test.type = sk->max_type; 1252abc6e134SChris Mason test.offset = sk->max_offset; 1253abc6e134SChris Mason 1254abc6e134SChris Mason ret = btrfs_comp_cpu_keys(key, &test); 1255abc6e134SChris Mason if (ret > 0) 1256ac8e9819SChris Mason return 0; 1257ac8e9819SChris Mason return 1; 1258ac8e9819SChris Mason } 1259ac8e9819SChris Mason 1260ac8e9819SChris Mason static noinline int copy_to_sk(struct btrfs_root *root, 1261ac8e9819SChris Mason struct btrfs_path *path, 1262ac8e9819SChris Mason struct btrfs_key *key, 1263ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk, 1264ac8e9819SChris Mason char *buf, 1265ac8e9819SChris Mason unsigned long *sk_offset, 1266ac8e9819SChris Mason int *num_found) 1267ac8e9819SChris Mason { 1268ac8e9819SChris Mason u64 found_transid; 1269ac8e9819SChris Mason struct extent_buffer *leaf; 1270ac8e9819SChris Mason struct btrfs_ioctl_search_header sh; 1271ac8e9819SChris Mason unsigned long item_off; 1272ac8e9819SChris Mason unsigned long item_len; 1273ac8e9819SChris Mason int nritems; 1274ac8e9819SChris Mason int i; 1275ac8e9819SChris Mason int slot; 1276ac8e9819SChris Mason int found = 0; 1277ac8e9819SChris Mason int ret = 0; 1278ac8e9819SChris Mason 1279ac8e9819SChris Mason leaf = path->nodes[0]; 1280ac8e9819SChris Mason slot = path->slots[0]; 1281ac8e9819SChris Mason nritems = btrfs_header_nritems(leaf); 1282ac8e9819SChris Mason 1283ac8e9819SChris Mason if (btrfs_header_generation(leaf) > sk->max_transid) { 1284ac8e9819SChris Mason i = nritems; 1285ac8e9819SChris Mason goto advance_key; 1286ac8e9819SChris Mason } 1287ac8e9819SChris Mason found_transid = btrfs_header_generation(leaf); 1288ac8e9819SChris Mason 1289ac8e9819SChris Mason for (i = slot; i < nritems; i++) { 1290ac8e9819SChris Mason item_off = btrfs_item_ptr_offset(leaf, i); 1291ac8e9819SChris Mason item_len = btrfs_item_size_nr(leaf, i); 1292ac8e9819SChris Mason 1293ac8e9819SChris Mason if (item_len > BTRFS_SEARCH_ARGS_BUFSIZE) 1294ac8e9819SChris Mason item_len = 0; 1295ac8e9819SChris Mason 1296ac8e9819SChris Mason if (sizeof(sh) + item_len + *sk_offset > 1297ac8e9819SChris Mason BTRFS_SEARCH_ARGS_BUFSIZE) { 1298ac8e9819SChris Mason ret = 1; 1299ac8e9819SChris Mason goto overflow; 1300ac8e9819SChris Mason } 1301ac8e9819SChris Mason 1302ac8e9819SChris Mason btrfs_item_key_to_cpu(leaf, key, i); 1303ac8e9819SChris Mason if (!key_in_sk(key, sk)) 1304ac8e9819SChris Mason continue; 1305ac8e9819SChris Mason 1306ac8e9819SChris Mason sh.objectid = key->objectid; 1307ac8e9819SChris Mason sh.offset = key->offset; 1308ac8e9819SChris Mason sh.type = key->type; 1309ac8e9819SChris Mason sh.len = item_len; 1310ac8e9819SChris Mason sh.transid = found_transid; 1311ac8e9819SChris Mason 1312ac8e9819SChris Mason /* copy search result header */ 1313ac8e9819SChris Mason memcpy(buf + *sk_offset, &sh, sizeof(sh)); 1314ac8e9819SChris Mason *sk_offset += sizeof(sh); 1315ac8e9819SChris Mason 1316ac8e9819SChris Mason if (item_len) { 1317ac8e9819SChris Mason char *p = buf + *sk_offset; 1318ac8e9819SChris Mason /* copy the item */ 1319ac8e9819SChris Mason read_extent_buffer(leaf, p, 1320ac8e9819SChris Mason item_off, item_len); 1321ac8e9819SChris Mason *sk_offset += item_len; 1322ac8e9819SChris Mason } 132390fdde14SChris Mason found++; 1324ac8e9819SChris Mason 1325ac8e9819SChris Mason if (*num_found >= sk->nr_items) 1326ac8e9819SChris Mason break; 1327ac8e9819SChris Mason } 1328ac8e9819SChris Mason advance_key: 1329ac8e9819SChris Mason ret = 0; 1330abc6e134SChris Mason if (key->offset < (u64)-1 && key->offset < sk->max_offset) 1331abc6e134SChris Mason key->offset++; 1332abc6e134SChris Mason else if (key->type < (u8)-1 && key->type < sk->max_type) { 1333abc6e134SChris Mason key->offset = 0; 1334abc6e134SChris Mason key->type++; 1335abc6e134SChris Mason } else if (key->objectid < (u64)-1 && key->objectid < sk->max_objectid) { 1336abc6e134SChris Mason key->offset = 0; 1337abc6e134SChris Mason key->type = 0; 1338abc6e134SChris Mason key->objectid++; 1339abc6e134SChris Mason } else 1340abc6e134SChris Mason ret = 1; 1341ac8e9819SChris Mason overflow: 1342ac8e9819SChris Mason *num_found += found; 1343ac8e9819SChris Mason return ret; 1344ac8e9819SChris Mason } 1345ac8e9819SChris Mason 1346ac8e9819SChris Mason static noinline int search_ioctl(struct inode *inode, 1347ac8e9819SChris Mason struct btrfs_ioctl_search_args *args) 1348ac8e9819SChris Mason { 1349ac8e9819SChris Mason struct btrfs_root *root; 1350ac8e9819SChris Mason struct btrfs_key key; 1351ac8e9819SChris Mason struct btrfs_key max_key; 1352ac8e9819SChris Mason struct btrfs_path *path; 1353ac8e9819SChris Mason struct btrfs_ioctl_search_key *sk = &args->key; 1354ac8e9819SChris Mason struct btrfs_fs_info *info = BTRFS_I(inode)->root->fs_info; 1355ac8e9819SChris Mason int ret; 1356ac8e9819SChris Mason int num_found = 0; 1357ac8e9819SChris Mason unsigned long sk_offset = 0; 1358ac8e9819SChris Mason 1359ac8e9819SChris Mason path = btrfs_alloc_path(); 1360ac8e9819SChris Mason if (!path) 1361ac8e9819SChris Mason return -ENOMEM; 1362ac8e9819SChris Mason 1363ac8e9819SChris Mason if (sk->tree_id == 0) { 1364ac8e9819SChris Mason /* search the root of the inode that was passed */ 1365ac8e9819SChris Mason root = BTRFS_I(inode)->root; 1366ac8e9819SChris Mason } else { 1367ac8e9819SChris Mason key.objectid = sk->tree_id; 1368ac8e9819SChris Mason key.type = BTRFS_ROOT_ITEM_KEY; 1369ac8e9819SChris Mason key.offset = (u64)-1; 1370ac8e9819SChris Mason root = btrfs_read_fs_root_no_name(info, &key); 1371ac8e9819SChris Mason if (IS_ERR(root)) { 1372ac8e9819SChris Mason printk(KERN_ERR "could not find root %llu\n", 1373ac8e9819SChris Mason sk->tree_id); 1374ac8e9819SChris Mason btrfs_free_path(path); 1375ac8e9819SChris Mason return -ENOENT; 1376ac8e9819SChris Mason } 1377ac8e9819SChris Mason } 1378ac8e9819SChris Mason 1379ac8e9819SChris Mason key.objectid = sk->min_objectid; 1380ac8e9819SChris Mason key.type = sk->min_type; 1381ac8e9819SChris Mason key.offset = sk->min_offset; 1382ac8e9819SChris Mason 1383ac8e9819SChris Mason max_key.objectid = sk->max_objectid; 1384ac8e9819SChris Mason max_key.type = sk->max_type; 1385ac8e9819SChris Mason max_key.offset = sk->max_offset; 1386ac8e9819SChris Mason 1387ac8e9819SChris Mason path->keep_locks = 1; 1388ac8e9819SChris Mason 1389ac8e9819SChris Mason while(1) { 1390ac8e9819SChris Mason ret = btrfs_search_forward(root, &key, &max_key, path, 0, 1391ac8e9819SChris Mason sk->min_transid); 1392ac8e9819SChris Mason if (ret != 0) { 1393ac8e9819SChris Mason if (ret > 0) 1394ac8e9819SChris Mason ret = 0; 1395ac8e9819SChris Mason goto err; 1396ac8e9819SChris Mason } 1397ac8e9819SChris Mason ret = copy_to_sk(root, path, &key, sk, args->buf, 1398ac8e9819SChris Mason &sk_offset, &num_found); 1399ac8e9819SChris Mason btrfs_release_path(root, path); 1400ac8e9819SChris Mason if (ret || num_found >= sk->nr_items) 1401ac8e9819SChris Mason break; 1402ac8e9819SChris Mason 1403ac8e9819SChris Mason } 1404ac8e9819SChris Mason ret = 0; 1405ac8e9819SChris Mason err: 1406ac8e9819SChris Mason sk->nr_items = num_found; 1407ac8e9819SChris Mason btrfs_free_path(path); 1408ac8e9819SChris Mason return ret; 1409ac8e9819SChris Mason } 1410ac8e9819SChris Mason 1411ac8e9819SChris Mason static noinline int btrfs_ioctl_tree_search(struct file *file, 1412ac8e9819SChris Mason void __user *argp) 1413ac8e9819SChris Mason { 1414ac8e9819SChris Mason struct btrfs_ioctl_search_args *args; 1415ac8e9819SChris Mason struct inode *inode; 1416ac8e9819SChris Mason int ret; 1417ac8e9819SChris Mason 1418ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1419ac8e9819SChris Mason return -EPERM; 1420ac8e9819SChris Mason 14212354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 14222354d08fSJulia Lawall if (IS_ERR(args)) 14232354d08fSJulia Lawall return PTR_ERR(args); 1424ac8e9819SChris Mason 1425ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1426ac8e9819SChris Mason ret = search_ioctl(inode, args); 1427ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1428ac8e9819SChris Mason ret = -EFAULT; 1429ac8e9819SChris Mason kfree(args); 1430ac8e9819SChris Mason return ret; 1431ac8e9819SChris Mason } 1432ac8e9819SChris Mason 143398d377a0STARUISI Hiroaki /* 1434ac8e9819SChris Mason * Search INODE_REFs to identify path name of 'dirid' directory 1435ac8e9819SChris Mason * in a 'tree_id' tree. and sets path name to 'name'. 143698d377a0STARUISI Hiroaki */ 143798d377a0STARUISI Hiroaki static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info, 143898d377a0STARUISI Hiroaki u64 tree_id, u64 dirid, char *name) 143998d377a0STARUISI Hiroaki { 144098d377a0STARUISI Hiroaki struct btrfs_root *root; 144198d377a0STARUISI Hiroaki struct btrfs_key key; 1442ac8e9819SChris Mason char *ptr; 144398d377a0STARUISI Hiroaki int ret = -1; 144498d377a0STARUISI Hiroaki int slot; 144598d377a0STARUISI Hiroaki int len; 144698d377a0STARUISI Hiroaki int total_len = 0; 144798d377a0STARUISI Hiroaki struct btrfs_inode_ref *iref; 144898d377a0STARUISI Hiroaki struct extent_buffer *l; 144998d377a0STARUISI Hiroaki struct btrfs_path *path; 145098d377a0STARUISI Hiroaki 145198d377a0STARUISI Hiroaki if (dirid == BTRFS_FIRST_FREE_OBJECTID) { 145298d377a0STARUISI Hiroaki name[0]='\0'; 145398d377a0STARUISI Hiroaki return 0; 145498d377a0STARUISI Hiroaki } 145598d377a0STARUISI Hiroaki 145698d377a0STARUISI Hiroaki path = btrfs_alloc_path(); 145798d377a0STARUISI Hiroaki if (!path) 145898d377a0STARUISI Hiroaki return -ENOMEM; 145998d377a0STARUISI Hiroaki 1460ac8e9819SChris Mason ptr = &name[BTRFS_INO_LOOKUP_PATH_MAX]; 146198d377a0STARUISI Hiroaki 146298d377a0STARUISI Hiroaki key.objectid = tree_id; 146398d377a0STARUISI Hiroaki key.type = BTRFS_ROOT_ITEM_KEY; 146498d377a0STARUISI Hiroaki key.offset = (u64)-1; 146598d377a0STARUISI Hiroaki root = btrfs_read_fs_root_no_name(info, &key); 146698d377a0STARUISI Hiroaki if (IS_ERR(root)) { 146798d377a0STARUISI Hiroaki printk(KERN_ERR "could not find root %llu\n", tree_id); 14688ad6fcabSChris Mason ret = -ENOENT; 14698ad6fcabSChris Mason goto out; 147098d377a0STARUISI Hiroaki } 147198d377a0STARUISI Hiroaki 147298d377a0STARUISI Hiroaki key.objectid = dirid; 147398d377a0STARUISI Hiroaki key.type = BTRFS_INODE_REF_KEY; 14748ad6fcabSChris Mason key.offset = (u64)-1; 147598d377a0STARUISI Hiroaki 147698d377a0STARUISI Hiroaki while(1) { 147798d377a0STARUISI Hiroaki ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 147898d377a0STARUISI Hiroaki if (ret < 0) 147998d377a0STARUISI Hiroaki goto out; 148098d377a0STARUISI Hiroaki 148198d377a0STARUISI Hiroaki l = path->nodes[0]; 148298d377a0STARUISI Hiroaki slot = path->slots[0]; 14838ad6fcabSChris Mason if (ret > 0 && slot > 0) 14848ad6fcabSChris Mason slot--; 148598d377a0STARUISI Hiroaki btrfs_item_key_to_cpu(l, &key, slot); 148698d377a0STARUISI Hiroaki 148798d377a0STARUISI Hiroaki if (ret > 0 && (key.objectid != dirid || 1488ac8e9819SChris Mason key.type != BTRFS_INODE_REF_KEY)) { 1489ac8e9819SChris Mason ret = -ENOENT; 149098d377a0STARUISI Hiroaki goto out; 1491ac8e9819SChris Mason } 149298d377a0STARUISI Hiroaki 149398d377a0STARUISI Hiroaki iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref); 149498d377a0STARUISI Hiroaki len = btrfs_inode_ref_name_len(l, iref); 149598d377a0STARUISI Hiroaki ptr -= len + 1; 149698d377a0STARUISI Hiroaki total_len += len + 1; 1497ac8e9819SChris Mason if (ptr < name) 149898d377a0STARUISI Hiroaki goto out; 149998d377a0STARUISI Hiroaki 150098d377a0STARUISI Hiroaki *(ptr + len) = '/'; 150198d377a0STARUISI Hiroaki read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len); 150298d377a0STARUISI Hiroaki 150398d377a0STARUISI Hiroaki if (key.offset == BTRFS_FIRST_FREE_OBJECTID) 150498d377a0STARUISI Hiroaki break; 150598d377a0STARUISI Hiroaki 150698d377a0STARUISI Hiroaki btrfs_release_path(root, path); 150798d377a0STARUISI Hiroaki key.objectid = key.offset; 15088ad6fcabSChris Mason key.offset = (u64)-1; 150998d377a0STARUISI Hiroaki dirid = key.objectid; 151098d377a0STARUISI Hiroaki 151198d377a0STARUISI Hiroaki } 1512ac8e9819SChris Mason if (ptr < name) 151398d377a0STARUISI Hiroaki goto out; 1514ac8e9819SChris Mason memcpy(name, ptr, total_len); 151598d377a0STARUISI Hiroaki name[total_len]='\0'; 151698d377a0STARUISI Hiroaki ret = 0; 151798d377a0STARUISI Hiroaki out: 151898d377a0STARUISI Hiroaki btrfs_free_path(path); 1519ac8e9819SChris Mason return ret; 1520ac8e9819SChris Mason } 1521ac8e9819SChris Mason 1522ac8e9819SChris Mason static noinline int btrfs_ioctl_ino_lookup(struct file *file, 1523ac8e9819SChris Mason void __user *argp) 1524ac8e9819SChris Mason { 1525ac8e9819SChris Mason struct btrfs_ioctl_ino_lookup_args *args; 1526ac8e9819SChris Mason struct inode *inode; 1527ac8e9819SChris Mason int ret; 1528ac8e9819SChris Mason 1529ac8e9819SChris Mason if (!capable(CAP_SYS_ADMIN)) 1530ac8e9819SChris Mason return -EPERM; 1531ac8e9819SChris Mason 15322354d08fSJulia Lawall args = memdup_user(argp, sizeof(*args)); 15332354d08fSJulia Lawall if (IS_ERR(args)) 15342354d08fSJulia Lawall return PTR_ERR(args); 1535c2b96929SDan Carpenter 1536ac8e9819SChris Mason inode = fdentry(file)->d_inode; 1537ac8e9819SChris Mason 15381b53ac4dSChris Mason if (args->treeid == 0) 15391b53ac4dSChris Mason args->treeid = BTRFS_I(inode)->root->root_key.objectid; 15401b53ac4dSChris Mason 1541ac8e9819SChris Mason ret = btrfs_search_path_in_tree(BTRFS_I(inode)->root->fs_info, 1542ac8e9819SChris Mason args->treeid, args->objectid, 1543ac8e9819SChris Mason args->name); 1544ac8e9819SChris Mason 1545ac8e9819SChris Mason if (ret == 0 && copy_to_user(argp, args, sizeof(*args))) 1546ac8e9819SChris Mason ret = -EFAULT; 1547ac8e9819SChris Mason 1548ac8e9819SChris Mason kfree(args); 154998d377a0STARUISI Hiroaki return ret; 155098d377a0STARUISI Hiroaki } 155198d377a0STARUISI Hiroaki 155276dda93cSYan, Zheng static noinline int btrfs_ioctl_snap_destroy(struct file *file, 155376dda93cSYan, Zheng void __user *arg) 155476dda93cSYan, Zheng { 155576dda93cSYan, Zheng struct dentry *parent = fdentry(file); 155676dda93cSYan, Zheng struct dentry *dentry; 155776dda93cSYan, Zheng struct inode *dir = parent->d_inode; 155876dda93cSYan, Zheng struct inode *inode; 155976dda93cSYan, Zheng struct btrfs_root *root = BTRFS_I(dir)->root; 156076dda93cSYan, Zheng struct btrfs_root *dest = NULL; 156176dda93cSYan, Zheng struct btrfs_ioctl_vol_args *vol_args; 156276dda93cSYan, Zheng struct btrfs_trans_handle *trans; 156376dda93cSYan, Zheng int namelen; 156476dda93cSYan, Zheng int ret; 156576dda93cSYan, Zheng int err = 0; 156676dda93cSYan, Zheng 156776dda93cSYan, Zheng vol_args = memdup_user(arg, sizeof(*vol_args)); 156876dda93cSYan, Zheng if (IS_ERR(vol_args)) 156976dda93cSYan, Zheng return PTR_ERR(vol_args); 157076dda93cSYan, Zheng 157176dda93cSYan, Zheng vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 157276dda93cSYan, Zheng namelen = strlen(vol_args->name); 157376dda93cSYan, Zheng if (strchr(vol_args->name, '/') || 157476dda93cSYan, Zheng strncmp(vol_args->name, "..", namelen) == 0) { 157576dda93cSYan, Zheng err = -EINVAL; 157676dda93cSYan, Zheng goto out; 157776dda93cSYan, Zheng } 157876dda93cSYan, Zheng 157976dda93cSYan, Zheng err = mnt_want_write(file->f_path.mnt); 158076dda93cSYan, Zheng if (err) 158176dda93cSYan, Zheng goto out; 158276dda93cSYan, Zheng 158376dda93cSYan, Zheng mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); 158476dda93cSYan, Zheng dentry = lookup_one_len(vol_args->name, parent, namelen); 158576dda93cSYan, Zheng if (IS_ERR(dentry)) { 158676dda93cSYan, Zheng err = PTR_ERR(dentry); 158776dda93cSYan, Zheng goto out_unlock_dir; 158876dda93cSYan, Zheng } 158976dda93cSYan, Zheng 159076dda93cSYan, Zheng if (!dentry->d_inode) { 159176dda93cSYan, Zheng err = -ENOENT; 159276dda93cSYan, Zheng goto out_dput; 159376dda93cSYan, Zheng } 159476dda93cSYan, Zheng 159576dda93cSYan, Zheng inode = dentry->d_inode; 15964260f7c7SSage Weil dest = BTRFS_I(inode)->root; 15974260f7c7SSage Weil if (!capable(CAP_SYS_ADMIN)){ 15984260f7c7SSage Weil /* 15994260f7c7SSage Weil * Regular user. Only allow this with a special mount 16004260f7c7SSage Weil * option, when the user has write+exec access to the 16014260f7c7SSage Weil * subvol root, and when rmdir(2) would have been 16024260f7c7SSage Weil * allowed. 16034260f7c7SSage Weil * 16044260f7c7SSage Weil * Note that this is _not_ check that the subvol is 16054260f7c7SSage Weil * empty or doesn't contain data that we wouldn't 16064260f7c7SSage Weil * otherwise be able to delete. 16074260f7c7SSage Weil * 16084260f7c7SSage Weil * Users who want to delete empty subvols should try 16094260f7c7SSage Weil * rmdir(2). 16104260f7c7SSage Weil */ 16114260f7c7SSage Weil err = -EPERM; 16124260f7c7SSage Weil if (!btrfs_test_opt(root, USER_SUBVOL_RM_ALLOWED)) 16134260f7c7SSage Weil goto out_dput; 16144260f7c7SSage Weil 16154260f7c7SSage Weil /* 16164260f7c7SSage Weil * Do not allow deletion if the parent dir is the same 16174260f7c7SSage Weil * as the dir to be deleted. That means the ioctl 16184260f7c7SSage Weil * must be called on the dentry referencing the root 16194260f7c7SSage Weil * of the subvol, not a random directory contained 16204260f7c7SSage Weil * within it. 16214260f7c7SSage Weil */ 16224260f7c7SSage Weil err = -EINVAL; 16234260f7c7SSage Weil if (root == dest) 16244260f7c7SSage Weil goto out_dput; 16254260f7c7SSage Weil 16264260f7c7SSage Weil err = inode_permission(inode, MAY_WRITE | MAY_EXEC); 16274260f7c7SSage Weil if (err) 16284260f7c7SSage Weil goto out_dput; 16294260f7c7SSage Weil 16304260f7c7SSage Weil /* check if subvolume may be deleted by a non-root user */ 16314260f7c7SSage Weil err = btrfs_may_delete(dir, dentry, 1); 16324260f7c7SSage Weil if (err) 16334260f7c7SSage Weil goto out_dput; 16344260f7c7SSage Weil } 16354260f7c7SSage Weil 163676dda93cSYan, Zheng if (inode->i_ino != BTRFS_FIRST_FREE_OBJECTID) { 163776dda93cSYan, Zheng err = -EINVAL; 163876dda93cSYan, Zheng goto out_dput; 163976dda93cSYan, Zheng } 164076dda93cSYan, Zheng 164176dda93cSYan, Zheng mutex_lock(&inode->i_mutex); 164276dda93cSYan, Zheng err = d_invalidate(dentry); 164376dda93cSYan, Zheng if (err) 164476dda93cSYan, Zheng goto out_unlock; 164576dda93cSYan, Zheng 164676dda93cSYan, Zheng down_write(&root->fs_info->subvol_sem); 164776dda93cSYan, Zheng 164876dda93cSYan, Zheng err = may_destroy_subvol(dest); 164976dda93cSYan, Zheng if (err) 165076dda93cSYan, Zheng goto out_up_write; 165176dda93cSYan, Zheng 1652a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 0); 1653a22285a6SYan, Zheng if (IS_ERR(trans)) { 1654a22285a6SYan, Zheng err = PTR_ERR(trans); 1655d327099aSDan Carpenter goto out_up_write; 1656a22285a6SYan, Zheng } 1657a22285a6SYan, Zheng trans->block_rsv = &root->fs_info->global_block_rsv; 1658a22285a6SYan, Zheng 165976dda93cSYan, Zheng ret = btrfs_unlink_subvol(trans, root, dir, 166076dda93cSYan, Zheng dest->root_key.objectid, 166176dda93cSYan, Zheng dentry->d_name.name, 166276dda93cSYan, Zheng dentry->d_name.len); 166376dda93cSYan, Zheng BUG_ON(ret); 166476dda93cSYan, Zheng 166576dda93cSYan, Zheng btrfs_record_root_in_trans(trans, dest); 166676dda93cSYan, Zheng 166776dda93cSYan, Zheng memset(&dest->root_item.drop_progress, 0, 166876dda93cSYan, Zheng sizeof(dest->root_item.drop_progress)); 166976dda93cSYan, Zheng dest->root_item.drop_level = 0; 167076dda93cSYan, Zheng btrfs_set_root_refs(&dest->root_item, 0); 167176dda93cSYan, Zheng 1672d68fc57bSYan, Zheng if (!xchg(&dest->orphan_item_inserted, 1)) { 167376dda93cSYan, Zheng ret = btrfs_insert_orphan_item(trans, 167476dda93cSYan, Zheng root->fs_info->tree_root, 167576dda93cSYan, Zheng dest->root_key.objectid); 167676dda93cSYan, Zheng BUG_ON(ret); 1677d68fc57bSYan, Zheng } 167876dda93cSYan, Zheng 1679531cb13fSSage Weil ret = btrfs_end_transaction(trans, root); 168076dda93cSYan, Zheng BUG_ON(ret); 168176dda93cSYan, Zheng inode->i_flags |= S_DEAD; 168276dda93cSYan, Zheng out_up_write: 168376dda93cSYan, Zheng up_write(&root->fs_info->subvol_sem); 168476dda93cSYan, Zheng out_unlock: 168576dda93cSYan, Zheng mutex_unlock(&inode->i_mutex); 168676dda93cSYan, Zheng if (!err) { 1687efefb143SYan, Zheng shrink_dcache_sb(root->fs_info->sb); 168876dda93cSYan, Zheng btrfs_invalidate_inodes(dest); 168976dda93cSYan, Zheng d_delete(dentry); 169076dda93cSYan, Zheng } 169176dda93cSYan, Zheng out_dput: 169276dda93cSYan, Zheng dput(dentry); 169376dda93cSYan, Zheng out_unlock_dir: 169476dda93cSYan, Zheng mutex_unlock(&dir->i_mutex); 169576dda93cSYan, Zheng mnt_drop_write(file->f_path.mnt); 169676dda93cSYan, Zheng out: 169776dda93cSYan, Zheng kfree(vol_args); 169876dda93cSYan, Zheng return err; 169976dda93cSYan, Zheng } 170076dda93cSYan, Zheng 17011e701a32SChris Mason static int btrfs_ioctl_defrag(struct file *file, void __user *argp) 1702f46b5a66SChristoph Hellwig { 1703f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1704f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 17051e701a32SChris Mason struct btrfs_ioctl_defrag_range_args *range; 1706c146afadSYan Zheng int ret; 1707c146afadSYan Zheng 1708b83cc969SLi Zefan if (btrfs_root_readonly(root)) 1709b83cc969SLi Zefan return -EROFS; 1710b83cc969SLi Zefan 1711c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1712c146afadSYan Zheng if (ret) 1713c146afadSYan Zheng return ret; 1714f46b5a66SChristoph Hellwig 1715f46b5a66SChristoph Hellwig switch (inode->i_mode & S_IFMT) { 1716f46b5a66SChristoph Hellwig case S_IFDIR: 1717e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) { 1718e441d54dSChris Mason ret = -EPERM; 1719e441d54dSChris Mason goto out; 1720e441d54dSChris Mason } 17218929ecfaSYan, Zheng ret = btrfs_defrag_root(root, 0); 17228929ecfaSYan, Zheng if (ret) 17238929ecfaSYan, Zheng goto out; 17248929ecfaSYan, Zheng ret = btrfs_defrag_root(root->fs_info->extent_root, 0); 1725f46b5a66SChristoph Hellwig break; 1726f46b5a66SChristoph Hellwig case S_IFREG: 1727e441d54dSChris Mason if (!(file->f_mode & FMODE_WRITE)) { 1728e441d54dSChris Mason ret = -EINVAL; 1729e441d54dSChris Mason goto out; 1730e441d54dSChris Mason } 17311e701a32SChris Mason 17321e701a32SChris Mason range = kzalloc(sizeof(*range), GFP_KERNEL); 17331e701a32SChris Mason if (!range) { 17341e701a32SChris Mason ret = -ENOMEM; 17351e701a32SChris Mason goto out; 17361e701a32SChris Mason } 17371e701a32SChris Mason 17381e701a32SChris Mason if (argp) { 17391e701a32SChris Mason if (copy_from_user(range, argp, 17401e701a32SChris Mason sizeof(*range))) { 17411e701a32SChris Mason ret = -EFAULT; 17421e701a32SChris Mason kfree(range); 1743683be16eSDan Carpenter goto out; 17441e701a32SChris Mason } 17451e701a32SChris Mason /* compression requires us to start the IO */ 17461e701a32SChris Mason if ((range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)) { 17471e701a32SChris Mason range->flags |= BTRFS_DEFRAG_RANGE_START_IO; 17481e701a32SChris Mason range->extent_thresh = (u32)-1; 17491e701a32SChris Mason } 17501e701a32SChris Mason } else { 17511e701a32SChris Mason /* the rest are all set to zero by kzalloc */ 17521e701a32SChris Mason range->len = (u64)-1; 17531e701a32SChris Mason } 17548929ecfaSYan, Zheng ret = btrfs_defrag_file(file, range); 17551e701a32SChris Mason kfree(range); 1756f46b5a66SChristoph Hellwig break; 17578929ecfaSYan, Zheng default: 17588929ecfaSYan, Zheng ret = -EINVAL; 1759f46b5a66SChristoph Hellwig } 1760e441d54dSChris Mason out: 1761ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 1762e441d54dSChris Mason return ret; 1763f46b5a66SChristoph Hellwig } 1764f46b5a66SChristoph Hellwig 1765b2950863SChristoph Hellwig static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) 1766f46b5a66SChristoph Hellwig { 1767f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1768f46b5a66SChristoph Hellwig int ret; 1769f46b5a66SChristoph Hellwig 1770e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1771e441d54dSChris Mason return -EPERM; 1772e441d54dSChris Mason 1773dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1774dae7b665SLi Zefan if (IS_ERR(vol_args)) 1775dae7b665SLi Zefan return PTR_ERR(vol_args); 1776f46b5a66SChristoph Hellwig 17775516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1778f46b5a66SChristoph Hellwig ret = btrfs_init_new_device(root, vol_args->name); 1779f46b5a66SChristoph Hellwig 1780f46b5a66SChristoph Hellwig kfree(vol_args); 1781f46b5a66SChristoph Hellwig return ret; 1782f46b5a66SChristoph Hellwig } 1783f46b5a66SChristoph Hellwig 1784b2950863SChristoph Hellwig static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) 1785f46b5a66SChristoph Hellwig { 1786f46b5a66SChristoph Hellwig struct btrfs_ioctl_vol_args *vol_args; 1787f46b5a66SChristoph Hellwig int ret; 1788f46b5a66SChristoph Hellwig 1789e441d54dSChris Mason if (!capable(CAP_SYS_ADMIN)) 1790e441d54dSChris Mason return -EPERM; 1791e441d54dSChris Mason 1792c146afadSYan Zheng if (root->fs_info->sb->s_flags & MS_RDONLY) 1793c146afadSYan Zheng return -EROFS; 1794c146afadSYan Zheng 1795dae7b665SLi Zefan vol_args = memdup_user(arg, sizeof(*vol_args)); 1796dae7b665SLi Zefan if (IS_ERR(vol_args)) 1797dae7b665SLi Zefan return PTR_ERR(vol_args); 1798f46b5a66SChristoph Hellwig 17995516e595SMark Fasheh vol_args->name[BTRFS_PATH_NAME_MAX] = '\0'; 1800f46b5a66SChristoph Hellwig ret = btrfs_rm_device(root, vol_args->name); 1801f46b5a66SChristoph Hellwig 1802f46b5a66SChristoph Hellwig kfree(vol_args); 1803f46b5a66SChristoph Hellwig return ret; 1804f46b5a66SChristoph Hellwig } 1805f46b5a66SChristoph Hellwig 180676dda93cSYan, Zheng static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 1807b2950863SChristoph Hellwig u64 off, u64 olen, u64 destoff) 1808f46b5a66SChristoph Hellwig { 1809f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 1810f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 1811f46b5a66SChristoph Hellwig struct file *src_file; 1812f46b5a66SChristoph Hellwig struct inode *src; 1813f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 1814f46b5a66SChristoph Hellwig struct btrfs_path *path; 1815f46b5a66SChristoph Hellwig struct extent_buffer *leaf; 1816ae01a0abSYan Zheng char *buf; 1817ae01a0abSYan Zheng struct btrfs_key key; 1818f46b5a66SChristoph Hellwig u32 nritems; 1819f46b5a66SChristoph Hellwig int slot; 1820ae01a0abSYan Zheng int ret; 1821c5c9cd4dSSage Weil u64 len = olen; 1822c5c9cd4dSSage Weil u64 bs = root->fs_info->sb->s_blocksize; 1823c5c9cd4dSSage Weil u64 hint_byte; 1824d20f7043SChris Mason 1825c5c9cd4dSSage Weil /* 1826c5c9cd4dSSage Weil * TODO: 1827c5c9cd4dSSage Weil * - split compressed inline extents. annoying: we need to 1828c5c9cd4dSSage Weil * decompress into destination's address_space (the file offset 1829c5c9cd4dSSage Weil * may change, so source mapping won't do), then recompress (or 1830c5c9cd4dSSage Weil * otherwise reinsert) a subrange. 1831c5c9cd4dSSage Weil * - allow ranges within the same file to be cloned (provided 1832c5c9cd4dSSage Weil * they don't overlap)? 1833c5c9cd4dSSage Weil */ 1834c5c9cd4dSSage Weil 1835e441d54dSChris Mason /* the destination must be opened for writing */ 18362ebc3464SDan Rosenberg if (!(file->f_mode & FMODE_WRITE) || (file->f_flags & O_APPEND)) 1837e441d54dSChris Mason return -EINVAL; 1838e441d54dSChris Mason 1839b83cc969SLi Zefan if (btrfs_root_readonly(root)) 1840b83cc969SLi Zefan return -EROFS; 1841b83cc969SLi Zefan 1842c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 1843c146afadSYan Zheng if (ret) 1844c146afadSYan Zheng return ret; 1845c146afadSYan Zheng 1846c5c9cd4dSSage Weil src_file = fget(srcfd); 1847ab67b7c1SYan Zheng if (!src_file) { 1848ab67b7c1SYan Zheng ret = -EBADF; 1849ab67b7c1SYan Zheng goto out_drop_write; 1850ab67b7c1SYan Zheng } 18515dc64164SDan Rosenberg 1852f46b5a66SChristoph Hellwig src = src_file->f_dentry->d_inode; 1853f46b5a66SChristoph Hellwig 1854c5c9cd4dSSage Weil ret = -EINVAL; 1855c5c9cd4dSSage Weil if (src == inode) 1856c5c9cd4dSSage Weil goto out_fput; 1857c5c9cd4dSSage Weil 18585dc64164SDan Rosenberg /* the src must be open for reading */ 18595dc64164SDan Rosenberg if (!(src_file->f_mode & FMODE_READ)) 18605dc64164SDan Rosenberg goto out_fput; 18615dc64164SDan Rosenberg 1862ae01a0abSYan Zheng ret = -EISDIR; 1863ae01a0abSYan Zheng if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) 1864f46b5a66SChristoph Hellwig goto out_fput; 1865f46b5a66SChristoph Hellwig 1866ae01a0abSYan Zheng ret = -EXDEV; 1867ae01a0abSYan Zheng if (src->i_sb != inode->i_sb || BTRFS_I(src)->root != root) 1868ae01a0abSYan Zheng goto out_fput; 1869ae01a0abSYan Zheng 1870ae01a0abSYan Zheng ret = -ENOMEM; 1871ae01a0abSYan Zheng buf = vmalloc(btrfs_level_size(root, 0)); 1872ae01a0abSYan Zheng if (!buf) 1873ae01a0abSYan Zheng goto out_fput; 1874ae01a0abSYan Zheng 1875ae01a0abSYan Zheng path = btrfs_alloc_path(); 1876ae01a0abSYan Zheng if (!path) { 1877ae01a0abSYan Zheng vfree(buf); 1878ae01a0abSYan Zheng goto out_fput; 1879ae01a0abSYan Zheng } 1880ae01a0abSYan Zheng path->reada = 2; 1881ae01a0abSYan Zheng 1882f46b5a66SChristoph Hellwig if (inode < src) { 1883fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_PARENT); 1884fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_CHILD); 1885f46b5a66SChristoph Hellwig } else { 1886fccdae43SSage Weil mutex_lock_nested(&src->i_mutex, I_MUTEX_PARENT); 1887fccdae43SSage Weil mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD); 1888f46b5a66SChristoph Hellwig } 1889f46b5a66SChristoph Hellwig 1890c5c9cd4dSSage Weil /* determine range to clone */ 1891c5c9cd4dSSage Weil ret = -EINVAL; 18922ebc3464SDan Rosenberg if (off + len > src->i_size || off + len < off) 1893f46b5a66SChristoph Hellwig goto out_unlock; 1894c5c9cd4dSSage Weil if (len == 0) 1895c5c9cd4dSSage Weil olen = len = src->i_size - off; 1896c5c9cd4dSSage Weil /* if we extend to eof, continue to block boundary */ 1897c5c9cd4dSSage Weil if (off + len == src->i_size) 18982a6b8daeSLi Zefan len = ALIGN(src->i_size, bs) - off; 1899c5c9cd4dSSage Weil 1900c5c9cd4dSSage Weil /* verify the end result is block aligned */ 19012a6b8daeSLi Zefan if (!IS_ALIGNED(off, bs) || !IS_ALIGNED(off + len, bs) || 19022a6b8daeSLi Zefan !IS_ALIGNED(destoff, bs)) 1903c5c9cd4dSSage Weil goto out_unlock; 1904c5c9cd4dSSage Weil 1905f46b5a66SChristoph Hellwig /* do any pending delalloc/csum calc on src, one way or 1906f46b5a66SChristoph Hellwig another, and lock file content */ 1907f46b5a66SChristoph Hellwig while (1) { 190831840ae1SZheng Yan struct btrfs_ordered_extent *ordered; 1909c5c9cd4dSSage Weil lock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 19109a019196SSage Weil ordered = btrfs_lookup_first_ordered_extent(src, off+len); 19119a019196SSage Weil if (!ordered && 19129a019196SSage Weil !test_range_bit(&BTRFS_I(src)->io_tree, off, off+len, 19139a019196SSage Weil EXTENT_DELALLOC, 0, NULL)) 1914f46b5a66SChristoph Hellwig break; 1915c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 1916ae01a0abSYan Zheng if (ordered) 1917ae01a0abSYan Zheng btrfs_put_ordered_extent(ordered); 19189a019196SSage Weil btrfs_wait_ordered_range(src, off, len); 1919f46b5a66SChristoph Hellwig } 1920f46b5a66SChristoph Hellwig 1921c5c9cd4dSSage Weil /* clone data */ 1922f46b5a66SChristoph Hellwig key.objectid = src->i_ino; 1923ae01a0abSYan Zheng key.type = BTRFS_EXTENT_DATA_KEY; 1924ae01a0abSYan Zheng key.offset = 0; 1925f46b5a66SChristoph Hellwig 1926f46b5a66SChristoph Hellwig while (1) { 1927f46b5a66SChristoph Hellwig /* 1928f46b5a66SChristoph Hellwig * note the key will change type as we walk through the 1929f46b5a66SChristoph Hellwig * tree. 1930f46b5a66SChristoph Hellwig */ 1931a22285a6SYan, Zheng ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); 1932f46b5a66SChristoph Hellwig if (ret < 0) 1933f46b5a66SChristoph Hellwig goto out; 1934f46b5a66SChristoph Hellwig 1935ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1936ae01a0abSYan Zheng if (path->slots[0] >= nritems) { 1937f46b5a66SChristoph Hellwig ret = btrfs_next_leaf(root, path); 1938f46b5a66SChristoph Hellwig if (ret < 0) 1939f46b5a66SChristoph Hellwig goto out; 1940f46b5a66SChristoph Hellwig if (ret > 0) 1941f46b5a66SChristoph Hellwig break; 1942ae01a0abSYan Zheng nritems = btrfs_header_nritems(path->nodes[0]); 1943f46b5a66SChristoph Hellwig } 1944f46b5a66SChristoph Hellwig leaf = path->nodes[0]; 1945f46b5a66SChristoph Hellwig slot = path->slots[0]; 1946f46b5a66SChristoph Hellwig 1947ae01a0abSYan Zheng btrfs_item_key_to_cpu(leaf, &key, slot); 1948d20f7043SChris Mason if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 1949f46b5a66SChristoph Hellwig key.objectid != src->i_ino) 1950f46b5a66SChristoph Hellwig break; 1951f46b5a66SChristoph Hellwig 1952c5c9cd4dSSage Weil if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { 1953c5c9cd4dSSage Weil struct btrfs_file_extent_item *extent; 1954c5c9cd4dSSage Weil int type; 195531840ae1SZheng Yan u32 size; 195631840ae1SZheng Yan struct btrfs_key new_key; 1957c5c9cd4dSSage Weil u64 disko = 0, diskl = 0; 1958c5c9cd4dSSage Weil u64 datao = 0, datal = 0; 1959c5c9cd4dSSage Weil u8 comp; 1960b5384d48SSage Weil u64 endoff; 196131840ae1SZheng Yan 196231840ae1SZheng Yan size = btrfs_item_size_nr(leaf, slot); 196331840ae1SZheng Yan read_extent_buffer(leaf, buf, 196431840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 196531840ae1SZheng Yan size); 1966c5c9cd4dSSage Weil 1967c5c9cd4dSSage Weil extent = btrfs_item_ptr(leaf, slot, 1968c5c9cd4dSSage Weil struct btrfs_file_extent_item); 1969c5c9cd4dSSage Weil comp = btrfs_file_extent_compression(leaf, extent); 1970c5c9cd4dSSage Weil type = btrfs_file_extent_type(leaf, extent); 1971c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 1972c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 1973d397712bSChris Mason disko = btrfs_file_extent_disk_bytenr(leaf, 1974d397712bSChris Mason extent); 1975d397712bSChris Mason diskl = btrfs_file_extent_disk_num_bytes(leaf, 1976d397712bSChris Mason extent); 1977c5c9cd4dSSage Weil datao = btrfs_file_extent_offset(leaf, extent); 1978d397712bSChris Mason datal = btrfs_file_extent_num_bytes(leaf, 1979d397712bSChris Mason extent); 1980c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 1981c5c9cd4dSSage Weil /* take upper bound, may be compressed */ 1982c5c9cd4dSSage Weil datal = btrfs_file_extent_ram_bytes(leaf, 1983c5c9cd4dSSage Weil extent); 1984c5c9cd4dSSage Weil } 198531840ae1SZheng Yan btrfs_release_path(root, path); 198631840ae1SZheng Yan 1987050006a7SSage Weil if (key.offset + datal <= off || 1988c5c9cd4dSSage Weil key.offset >= off+len) 1989c5c9cd4dSSage Weil goto next; 1990c5c9cd4dSSage Weil 199131840ae1SZheng Yan memcpy(&new_key, &key, sizeof(new_key)); 199231840ae1SZheng Yan new_key.objectid = inode->i_ino; 19934d728ec7SLi Zefan if (off <= key.offset) 1994c5c9cd4dSSage Weil new_key.offset = key.offset + destoff - off; 19954d728ec7SLi Zefan else 19964d728ec7SLi Zefan new_key.offset = destoff; 1997c5c9cd4dSSage Weil 1998a22285a6SYan, Zheng trans = btrfs_start_transaction(root, 1); 1999a22285a6SYan, Zheng if (IS_ERR(trans)) { 2000a22285a6SYan, Zheng ret = PTR_ERR(trans); 2001a22285a6SYan, Zheng goto out; 2002a22285a6SYan, Zheng } 2003a22285a6SYan, Zheng 2004c8a894d7SChris Mason if (type == BTRFS_FILE_EXTENT_REG || 2005c8a894d7SChris Mason type == BTRFS_FILE_EXTENT_PREALLOC) { 2006a22285a6SYan, Zheng if (off > key.offset) { 2007a22285a6SYan, Zheng datao += off - key.offset; 2008a22285a6SYan, Zheng datal -= off - key.offset; 2009a22285a6SYan, Zheng } 2010a22285a6SYan, Zheng 2011a22285a6SYan, Zheng if (key.offset + datal > off + len) 2012a22285a6SYan, Zheng datal = off + len - key.offset; 2013a22285a6SYan, Zheng 2014a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2015a22285a6SYan, Zheng new_key.offset, 2016a22285a6SYan, Zheng new_key.offset + datal, 2017a22285a6SYan, Zheng &hint_byte, 1); 2018a22285a6SYan, Zheng BUG_ON(ret); 2019a22285a6SYan, Zheng 202031840ae1SZheng Yan ret = btrfs_insert_empty_item(trans, root, path, 202131840ae1SZheng Yan &new_key, size); 2022a22285a6SYan, Zheng BUG_ON(ret); 202331840ae1SZheng Yan 202431840ae1SZheng Yan leaf = path->nodes[0]; 202531840ae1SZheng Yan slot = path->slots[0]; 202631840ae1SZheng Yan write_extent_buffer(leaf, buf, 202731840ae1SZheng Yan btrfs_item_ptr_offset(leaf, slot), 202831840ae1SZheng Yan size); 2029ae01a0abSYan Zheng 2030f46b5a66SChristoph Hellwig extent = btrfs_item_ptr(leaf, slot, 2031f46b5a66SChristoph Hellwig struct btrfs_file_extent_item); 2032c5c9cd4dSSage Weil 2033c5c9cd4dSSage Weil /* disko == 0 means it's a hole */ 2034c5c9cd4dSSage Weil if (!disko) 2035c5c9cd4dSSage Weil datao = 0; 2036c5c9cd4dSSage Weil 2037c5c9cd4dSSage Weil btrfs_set_file_extent_offset(leaf, extent, 2038c5c9cd4dSSage Weil datao); 2039c5c9cd4dSSage Weil btrfs_set_file_extent_num_bytes(leaf, extent, 2040c5c9cd4dSSage Weil datal); 2041c5c9cd4dSSage Weil if (disko) { 2042c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2043ae01a0abSYan Zheng ret = btrfs_inc_extent_ref(trans, root, 20445d4f98a2SYan Zheng disko, diskl, 0, 2045f46b5a66SChristoph Hellwig root->root_key.objectid, 20465d4f98a2SYan Zheng inode->i_ino, 20475d4f98a2SYan Zheng new_key.offset - datao); 2048ae01a0abSYan Zheng BUG_ON(ret); 2049f46b5a66SChristoph Hellwig } 2050c5c9cd4dSSage Weil } else if (type == BTRFS_FILE_EXTENT_INLINE) { 2051c5c9cd4dSSage Weil u64 skip = 0; 2052c5c9cd4dSSage Weil u64 trim = 0; 2053c5c9cd4dSSage Weil if (off > key.offset) { 2054c5c9cd4dSSage Weil skip = off - key.offset; 2055c5c9cd4dSSage Weil new_key.offset += skip; 205631840ae1SZheng Yan } 2057d397712bSChris Mason 2058c5c9cd4dSSage Weil if (key.offset + datal > off+len) 2059c5c9cd4dSSage Weil trim = key.offset + datal - (off+len); 2060d397712bSChris Mason 2061c5c9cd4dSSage Weil if (comp && (skip || trim)) { 2062c5c9cd4dSSage Weil ret = -EINVAL; 2063a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2064c5c9cd4dSSage Weil goto out; 206531840ae1SZheng Yan } 2066c5c9cd4dSSage Weil size -= skip + trim; 2067c5c9cd4dSSage Weil datal -= skip + trim; 2068a22285a6SYan, Zheng 2069a22285a6SYan, Zheng ret = btrfs_drop_extents(trans, inode, 2070a22285a6SYan, Zheng new_key.offset, 2071a22285a6SYan, Zheng new_key.offset + datal, 2072a22285a6SYan, Zheng &hint_byte, 1); 2073a22285a6SYan, Zheng BUG_ON(ret); 2074a22285a6SYan, Zheng 2075c5c9cd4dSSage Weil ret = btrfs_insert_empty_item(trans, root, path, 2076c5c9cd4dSSage Weil &new_key, size); 2077a22285a6SYan, Zheng BUG_ON(ret); 2078c5c9cd4dSSage Weil 2079c5c9cd4dSSage Weil if (skip) { 2080d397712bSChris Mason u32 start = 2081d397712bSChris Mason btrfs_file_extent_calc_inline_size(0); 2082c5c9cd4dSSage Weil memmove(buf+start, buf+start+skip, 2083c5c9cd4dSSage Weil datal); 2084c5c9cd4dSSage Weil } 2085c5c9cd4dSSage Weil 2086c5c9cd4dSSage Weil leaf = path->nodes[0]; 2087c5c9cd4dSSage Weil slot = path->slots[0]; 2088c5c9cd4dSSage Weil write_extent_buffer(leaf, buf, 2089c5c9cd4dSSage Weil btrfs_item_ptr_offset(leaf, slot), 2090c5c9cd4dSSage Weil size); 2091c5c9cd4dSSage Weil inode_add_bytes(inode, datal); 2092c5c9cd4dSSage Weil } 2093c5c9cd4dSSage Weil 2094c5c9cd4dSSage Weil btrfs_mark_buffer_dirty(leaf); 2095a22285a6SYan, Zheng btrfs_release_path(root, path); 2096c5c9cd4dSSage Weil 2097a22285a6SYan, Zheng inode->i_mtime = inode->i_ctime = CURRENT_TIME; 2098b5384d48SSage Weil 2099b5384d48SSage Weil /* 2100b5384d48SSage Weil * we round up to the block size at eof when 2101b5384d48SSage Weil * determining which extents to clone above, 2102b5384d48SSage Weil * but shouldn't round up the file size 2103b5384d48SSage Weil */ 2104b5384d48SSage Weil endoff = new_key.offset + datal; 21055f3888ffSLi Zefan if (endoff > destoff+olen) 21065f3888ffSLi Zefan endoff = destoff+olen; 2107b5384d48SSage Weil if (endoff > inode->i_size) 2108b5384d48SSage Weil btrfs_i_size_write(inode, endoff); 2109b5384d48SSage Weil 2110a22285a6SYan, Zheng BTRFS_I(inode)->flags = BTRFS_I(src)->flags; 2111a22285a6SYan, Zheng ret = btrfs_update_inode(trans, root, inode); 2112a22285a6SYan, Zheng BUG_ON(ret); 2113a22285a6SYan, Zheng btrfs_end_transaction(trans, root); 2114a22285a6SYan, Zheng } 2115c5c9cd4dSSage Weil next: 211631840ae1SZheng Yan btrfs_release_path(root, path); 2117ae01a0abSYan Zheng key.offset++; 2118ae01a0abSYan Zheng } 2119f46b5a66SChristoph Hellwig ret = 0; 2120f46b5a66SChristoph Hellwig out: 2121ae01a0abSYan Zheng btrfs_release_path(root, path); 2122c5c9cd4dSSage Weil unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS); 2123f46b5a66SChristoph Hellwig out_unlock: 2124f46b5a66SChristoph Hellwig mutex_unlock(&src->i_mutex); 2125f46b5a66SChristoph Hellwig mutex_unlock(&inode->i_mutex); 2126ae01a0abSYan Zheng vfree(buf); 2127ae01a0abSYan Zheng btrfs_free_path(path); 2128f46b5a66SChristoph Hellwig out_fput: 2129f46b5a66SChristoph Hellwig fput(src_file); 2130ab67b7c1SYan Zheng out_drop_write: 2131ab67b7c1SYan Zheng mnt_drop_write(file->f_path.mnt); 2132f46b5a66SChristoph Hellwig return ret; 2133f46b5a66SChristoph Hellwig } 2134f46b5a66SChristoph Hellwig 21357a865e8aSChristoph Hellwig static long btrfs_ioctl_clone_range(struct file *file, void __user *argp) 2136c5c9cd4dSSage Weil { 2137c5c9cd4dSSage Weil struct btrfs_ioctl_clone_range_args args; 2138c5c9cd4dSSage Weil 21397a865e8aSChristoph Hellwig if (copy_from_user(&args, argp, sizeof(args))) 2140c5c9cd4dSSage Weil return -EFAULT; 2141c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, args.src_fd, args.src_offset, 2142c5c9cd4dSSage Weil args.src_length, args.dest_offset); 2143c5c9cd4dSSage Weil } 2144c5c9cd4dSSage Weil 2145f46b5a66SChristoph Hellwig /* 2146f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2147f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2148f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2149f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2150f46b5a66SChristoph Hellwig */ 2151b2950863SChristoph Hellwig static long btrfs_ioctl_trans_start(struct file *file) 2152f46b5a66SChristoph Hellwig { 2153f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2154f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2155f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 21561ab86aedSSage Weil int ret; 2157f46b5a66SChristoph Hellwig 21581ab86aedSSage Weil ret = -EPERM; 2159df5b5520SChristoph Hellwig if (!capable(CAP_SYS_ADMIN)) 2160f46b5a66SChristoph Hellwig goto out; 21611ab86aedSSage Weil 21621ab86aedSSage Weil ret = -EINPROGRESS; 21631ab86aedSSage Weil if (file->private_data) 21641ab86aedSSage Weil goto out; 21659ca9ee09SSage Weil 2166b83cc969SLi Zefan ret = -EROFS; 2167b83cc969SLi Zefan if (btrfs_root_readonly(root)) 2168b83cc969SLi Zefan goto out; 2169b83cc969SLi Zefan 2170c146afadSYan Zheng ret = mnt_want_write(file->f_path.mnt); 2171c146afadSYan Zheng if (ret) 2172c146afadSYan Zheng goto out; 2173c146afadSYan Zheng 21749ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 21759ca9ee09SSage Weil root->fs_info->open_ioctl_trans++; 21769ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 21779ca9ee09SSage Weil 2178f46b5a66SChristoph Hellwig ret = -ENOMEM; 21791ab86aedSSage Weil trans = btrfs_start_ioctl_transaction(root, 0); 2180abd30bb0STsutomu Itoh if (IS_ERR(trans)) 21811ab86aedSSage Weil goto out_drop; 21821ab86aedSSage Weil 21831ab86aedSSage Weil file->private_data = trans; 21841ab86aedSSage Weil return 0; 21851ab86aedSSage Weil 21861ab86aedSSage Weil out_drop: 21871ab86aedSSage Weil mutex_lock(&root->fs_info->trans_mutex); 21881ab86aedSSage Weil root->fs_info->open_ioctl_trans--; 21891ab86aedSSage Weil mutex_unlock(&root->fs_info->trans_mutex); 21901ab86aedSSage Weil mnt_drop_write(file->f_path.mnt); 2191f46b5a66SChristoph Hellwig out: 2192f46b5a66SChristoph Hellwig return ret; 2193f46b5a66SChristoph Hellwig } 2194f46b5a66SChristoph Hellwig 21956ef5ed0dSJosef Bacik static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) 21966ef5ed0dSJosef Bacik { 21976ef5ed0dSJosef Bacik struct inode *inode = fdentry(file)->d_inode; 21986ef5ed0dSJosef Bacik struct btrfs_root *root = BTRFS_I(inode)->root; 21996ef5ed0dSJosef Bacik struct btrfs_root *new_root; 22006ef5ed0dSJosef Bacik struct btrfs_dir_item *di; 22016ef5ed0dSJosef Bacik struct btrfs_trans_handle *trans; 22026ef5ed0dSJosef Bacik struct btrfs_path *path; 22036ef5ed0dSJosef Bacik struct btrfs_key location; 22046ef5ed0dSJosef Bacik struct btrfs_disk_key disk_key; 22056ef5ed0dSJosef Bacik struct btrfs_super_block *disk_super; 22066ef5ed0dSJosef Bacik u64 features; 22076ef5ed0dSJosef Bacik u64 objectid = 0; 22086ef5ed0dSJosef Bacik u64 dir_id; 22096ef5ed0dSJosef Bacik 22106ef5ed0dSJosef Bacik if (!capable(CAP_SYS_ADMIN)) 22116ef5ed0dSJosef Bacik return -EPERM; 22126ef5ed0dSJosef Bacik 22136ef5ed0dSJosef Bacik if (copy_from_user(&objectid, argp, sizeof(objectid))) 22146ef5ed0dSJosef Bacik return -EFAULT; 22156ef5ed0dSJosef Bacik 22166ef5ed0dSJosef Bacik if (!objectid) 22176ef5ed0dSJosef Bacik objectid = root->root_key.objectid; 22186ef5ed0dSJosef Bacik 22196ef5ed0dSJosef Bacik location.objectid = objectid; 22206ef5ed0dSJosef Bacik location.type = BTRFS_ROOT_ITEM_KEY; 22216ef5ed0dSJosef Bacik location.offset = (u64)-1; 22226ef5ed0dSJosef Bacik 22236ef5ed0dSJosef Bacik new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); 22246ef5ed0dSJosef Bacik if (IS_ERR(new_root)) 22256ef5ed0dSJosef Bacik return PTR_ERR(new_root); 22266ef5ed0dSJosef Bacik 22276ef5ed0dSJosef Bacik if (btrfs_root_refs(&new_root->root_item) == 0) 22286ef5ed0dSJosef Bacik return -ENOENT; 22296ef5ed0dSJosef Bacik 22306ef5ed0dSJosef Bacik path = btrfs_alloc_path(); 22316ef5ed0dSJosef Bacik if (!path) 22326ef5ed0dSJosef Bacik return -ENOMEM; 22336ef5ed0dSJosef Bacik path->leave_spinning = 1; 22346ef5ed0dSJosef Bacik 22356ef5ed0dSJosef Bacik trans = btrfs_start_transaction(root, 1); 223698d5dc13STsutomu Itoh if (IS_ERR(trans)) { 22376ef5ed0dSJosef Bacik btrfs_free_path(path); 223898d5dc13STsutomu Itoh return PTR_ERR(trans); 22396ef5ed0dSJosef Bacik } 22406ef5ed0dSJosef Bacik 22416ef5ed0dSJosef Bacik dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); 22426ef5ed0dSJosef Bacik di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, 22436ef5ed0dSJosef Bacik dir_id, "default", 7, 1); 2244cf1e99a4SDan Carpenter if (IS_ERR_OR_NULL(di)) { 22456ef5ed0dSJosef Bacik btrfs_free_path(path); 22466ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 22476ef5ed0dSJosef Bacik printk(KERN_ERR "Umm, you don't have the default dir item, " 22486ef5ed0dSJosef Bacik "this isn't going to work\n"); 22496ef5ed0dSJosef Bacik return -ENOENT; 22506ef5ed0dSJosef Bacik } 22516ef5ed0dSJosef Bacik 22526ef5ed0dSJosef Bacik btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); 22536ef5ed0dSJosef Bacik btrfs_set_dir_item_key(path->nodes[0], di, &disk_key); 22546ef5ed0dSJosef Bacik btrfs_mark_buffer_dirty(path->nodes[0]); 22556ef5ed0dSJosef Bacik btrfs_free_path(path); 22566ef5ed0dSJosef Bacik 22576ef5ed0dSJosef Bacik disk_super = &root->fs_info->super_copy; 22586ef5ed0dSJosef Bacik features = btrfs_super_incompat_flags(disk_super); 22596ef5ed0dSJosef Bacik if (!(features & BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL)) { 22606ef5ed0dSJosef Bacik features |= BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL; 22616ef5ed0dSJosef Bacik btrfs_set_super_incompat_flags(disk_super, features); 22626ef5ed0dSJosef Bacik } 22636ef5ed0dSJosef Bacik btrfs_end_transaction(trans, root); 22646ef5ed0dSJosef Bacik 22656ef5ed0dSJosef Bacik return 0; 22666ef5ed0dSJosef Bacik } 22676ef5ed0dSJosef Bacik 2268bf5fc093SJosef Bacik static void get_block_group_info(struct list_head *groups_list, 2269bf5fc093SJosef Bacik struct btrfs_ioctl_space_info *space) 2270bf5fc093SJosef Bacik { 2271bf5fc093SJosef Bacik struct btrfs_block_group_cache *block_group; 2272bf5fc093SJosef Bacik 2273bf5fc093SJosef Bacik space->total_bytes = 0; 2274bf5fc093SJosef Bacik space->used_bytes = 0; 2275bf5fc093SJosef Bacik space->flags = 0; 2276bf5fc093SJosef Bacik list_for_each_entry(block_group, groups_list, list) { 2277bf5fc093SJosef Bacik space->flags = block_group->flags; 2278bf5fc093SJosef Bacik space->total_bytes += block_group->key.offset; 2279bf5fc093SJosef Bacik space->used_bytes += 2280bf5fc093SJosef Bacik btrfs_block_group_used(&block_group->item); 2281bf5fc093SJosef Bacik } 2282bf5fc093SJosef Bacik } 2283bf5fc093SJosef Bacik 22841406e432SJosef Bacik long btrfs_ioctl_space_info(struct btrfs_root *root, void __user *arg) 22851406e432SJosef Bacik { 22861406e432SJosef Bacik struct btrfs_ioctl_space_args space_args; 22871406e432SJosef Bacik struct btrfs_ioctl_space_info space; 22881406e432SJosef Bacik struct btrfs_ioctl_space_info *dest; 22897fde62bfSChris Mason struct btrfs_ioctl_space_info *dest_orig; 229013f2696fSDaniel J Blueman struct btrfs_ioctl_space_info __user *user_dest; 22911406e432SJosef Bacik struct btrfs_space_info *info; 2292bf5fc093SJosef Bacik u64 types[] = {BTRFS_BLOCK_GROUP_DATA, 2293bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_SYSTEM, 2294bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_METADATA, 2295bf5fc093SJosef Bacik BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; 2296bf5fc093SJosef Bacik int num_types = 4; 22977fde62bfSChris Mason int alloc_size; 22981406e432SJosef Bacik int ret = 0; 229951788b1bSDan Rosenberg u64 slot_count = 0; 2300bf5fc093SJosef Bacik int i, c; 23011406e432SJosef Bacik 23021406e432SJosef Bacik if (copy_from_user(&space_args, 23031406e432SJosef Bacik (struct btrfs_ioctl_space_args __user *)arg, 23041406e432SJosef Bacik sizeof(space_args))) 23051406e432SJosef Bacik return -EFAULT; 23061406e432SJosef Bacik 2307bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2308bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2309bf5fc093SJosef Bacik 2310bf5fc093SJosef Bacik info = NULL; 23117fde62bfSChris Mason rcu_read_lock(); 2312bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2313bf5fc093SJosef Bacik list) { 2314bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2315bf5fc093SJosef Bacik info = tmp; 2316bf5fc093SJosef Bacik break; 2317bf5fc093SJosef Bacik } 2318bf5fc093SJosef Bacik } 23197fde62bfSChris Mason rcu_read_unlock(); 23201406e432SJosef Bacik 2321bf5fc093SJosef Bacik if (!info) 2322bf5fc093SJosef Bacik continue; 2323bf5fc093SJosef Bacik 2324bf5fc093SJosef Bacik down_read(&info->groups_sem); 2325bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2326bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) 2327bf5fc093SJosef Bacik slot_count++; 2328bf5fc093SJosef Bacik } 2329bf5fc093SJosef Bacik up_read(&info->groups_sem); 2330bf5fc093SJosef Bacik } 2331bf5fc093SJosef Bacik 23327fde62bfSChris Mason /* space_slots == 0 means they are asking for a count */ 23337fde62bfSChris Mason if (space_args.space_slots == 0) { 23347fde62bfSChris Mason space_args.total_spaces = slot_count; 23357fde62bfSChris Mason goto out; 23367fde62bfSChris Mason } 2337bf5fc093SJosef Bacik 233851788b1bSDan Rosenberg slot_count = min_t(u64, space_args.space_slots, slot_count); 2339bf5fc093SJosef Bacik 23407fde62bfSChris Mason alloc_size = sizeof(*dest) * slot_count; 2341bf5fc093SJosef Bacik 23427fde62bfSChris Mason /* we generally have at most 6 or so space infos, one for each raid 23437fde62bfSChris Mason * level. So, a whole page should be more than enough for everyone 23447fde62bfSChris Mason */ 23457fde62bfSChris Mason if (alloc_size > PAGE_CACHE_SIZE) 23467fde62bfSChris Mason return -ENOMEM; 23477fde62bfSChris Mason 23487fde62bfSChris Mason space_args.total_spaces = 0; 23497fde62bfSChris Mason dest = kmalloc(alloc_size, GFP_NOFS); 23507fde62bfSChris Mason if (!dest) 23517fde62bfSChris Mason return -ENOMEM; 23527fde62bfSChris Mason dest_orig = dest; 23537fde62bfSChris Mason 23547fde62bfSChris Mason /* now we have a buffer to copy into */ 2355bf5fc093SJosef Bacik for (i = 0; i < num_types; i++) { 2356bf5fc093SJosef Bacik struct btrfs_space_info *tmp; 2357bf5fc093SJosef Bacik 235851788b1bSDan Rosenberg if (!slot_count) 235951788b1bSDan Rosenberg break; 236051788b1bSDan Rosenberg 2361bf5fc093SJosef Bacik info = NULL; 23621406e432SJosef Bacik rcu_read_lock(); 2363bf5fc093SJosef Bacik list_for_each_entry_rcu(tmp, &root->fs_info->space_info, 2364bf5fc093SJosef Bacik list) { 2365bf5fc093SJosef Bacik if (tmp->flags == types[i]) { 2366bf5fc093SJosef Bacik info = tmp; 23677fde62bfSChris Mason break; 2368bf5fc093SJosef Bacik } 2369bf5fc093SJosef Bacik } 2370bf5fc093SJosef Bacik rcu_read_unlock(); 23717fde62bfSChris Mason 2372bf5fc093SJosef Bacik if (!info) 2373bf5fc093SJosef Bacik continue; 2374bf5fc093SJosef Bacik down_read(&info->groups_sem); 2375bf5fc093SJosef Bacik for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { 2376bf5fc093SJosef Bacik if (!list_empty(&info->block_groups[c])) { 2377bf5fc093SJosef Bacik get_block_group_info(&info->block_groups[c], 2378bf5fc093SJosef Bacik &space); 23797fde62bfSChris Mason memcpy(dest, &space, sizeof(space)); 23801406e432SJosef Bacik dest++; 23811406e432SJosef Bacik space_args.total_spaces++; 238251788b1bSDan Rosenberg slot_count--; 23831406e432SJosef Bacik } 238451788b1bSDan Rosenberg if (!slot_count) 238551788b1bSDan Rosenberg break; 2386bf5fc093SJosef Bacik } 2387bf5fc093SJosef Bacik up_read(&info->groups_sem); 2388bf5fc093SJosef Bacik } 23891406e432SJosef Bacik 23907fde62bfSChris Mason user_dest = (struct btrfs_ioctl_space_info *) 23917fde62bfSChris Mason (arg + sizeof(struct btrfs_ioctl_space_args)); 23927fde62bfSChris Mason 23937fde62bfSChris Mason if (copy_to_user(user_dest, dest_orig, alloc_size)) 23947fde62bfSChris Mason ret = -EFAULT; 23957fde62bfSChris Mason 23967fde62bfSChris Mason kfree(dest_orig); 23977fde62bfSChris Mason out: 23987fde62bfSChris Mason if (ret == 0 && copy_to_user(arg, &space_args, sizeof(space_args))) 23991406e432SJosef Bacik ret = -EFAULT; 24001406e432SJosef Bacik 24011406e432SJosef Bacik return ret; 24021406e432SJosef Bacik } 24031406e432SJosef Bacik 2404f46b5a66SChristoph Hellwig /* 2405f46b5a66SChristoph Hellwig * there are many ways the trans_start and trans_end ioctls can lead 2406f46b5a66SChristoph Hellwig * to deadlocks. They should only be used by applications that 2407f46b5a66SChristoph Hellwig * basically own the machine, and have a very in depth understanding 2408f46b5a66SChristoph Hellwig * of all the possible deadlocks and enospc problems. 2409f46b5a66SChristoph Hellwig */ 2410f46b5a66SChristoph Hellwig long btrfs_ioctl_trans_end(struct file *file) 2411f46b5a66SChristoph Hellwig { 2412f46b5a66SChristoph Hellwig struct inode *inode = fdentry(file)->d_inode; 2413f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(inode)->root; 2414f46b5a66SChristoph Hellwig struct btrfs_trans_handle *trans; 2415f46b5a66SChristoph Hellwig 2416f46b5a66SChristoph Hellwig trans = file->private_data; 24171ab86aedSSage Weil if (!trans) 24181ab86aedSSage Weil return -EINVAL; 2419b214107eSChristoph Hellwig file->private_data = NULL; 24209ca9ee09SSage Weil 24211ab86aedSSage Weil btrfs_end_transaction(trans, root); 24221ab86aedSSage Weil 24239ca9ee09SSage Weil mutex_lock(&root->fs_info->trans_mutex); 24249ca9ee09SSage Weil root->fs_info->open_ioctl_trans--; 24259ca9ee09SSage Weil mutex_unlock(&root->fs_info->trans_mutex); 24269ca9ee09SSage Weil 2427cfc8ea87SSage Weil mnt_drop_write(file->f_path.mnt); 24281ab86aedSSage Weil return 0; 2429f46b5a66SChristoph Hellwig } 2430f46b5a66SChristoph Hellwig 243146204592SSage Weil static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) 243246204592SSage Weil { 243346204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 243446204592SSage Weil struct btrfs_trans_handle *trans; 243546204592SSage Weil u64 transid; 2436db5b493aSTsutomu Itoh int ret; 243746204592SSage Weil 243846204592SSage Weil trans = btrfs_start_transaction(root, 0); 243998d5dc13STsutomu Itoh if (IS_ERR(trans)) 244098d5dc13STsutomu Itoh return PTR_ERR(trans); 244146204592SSage Weil transid = trans->transid; 2442db5b493aSTsutomu Itoh ret = btrfs_commit_transaction_async(trans, root, 0); 24438b2b2d3cSTsutomu Itoh if (ret) { 24448b2b2d3cSTsutomu Itoh btrfs_end_transaction(trans, root); 2445db5b493aSTsutomu Itoh return ret; 24468b2b2d3cSTsutomu Itoh } 244746204592SSage Weil 244846204592SSage Weil if (argp) 244946204592SSage Weil if (copy_to_user(argp, &transid, sizeof(transid))) 245046204592SSage Weil return -EFAULT; 245146204592SSage Weil return 0; 245246204592SSage Weil } 245346204592SSage Weil 245446204592SSage Weil static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) 245546204592SSage Weil { 245646204592SSage Weil struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; 245746204592SSage Weil u64 transid; 245846204592SSage Weil 245946204592SSage Weil if (argp) { 246046204592SSage Weil if (copy_from_user(&transid, argp, sizeof(transid))) 246146204592SSage Weil return -EFAULT; 246246204592SSage Weil } else { 246346204592SSage Weil transid = 0; /* current trans */ 246446204592SSage Weil } 246546204592SSage Weil return btrfs_wait_for_commit(root, transid); 246646204592SSage Weil } 246746204592SSage Weil 2468f46b5a66SChristoph Hellwig long btrfs_ioctl(struct file *file, unsigned int 2469f46b5a66SChristoph Hellwig cmd, unsigned long arg) 2470f46b5a66SChristoph Hellwig { 2471f46b5a66SChristoph Hellwig struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; 24724bcabaa3SChristoph Hellwig void __user *argp = (void __user *)arg; 2473f46b5a66SChristoph Hellwig 2474f46b5a66SChristoph Hellwig switch (cmd) { 24756cbff00fSChristoph Hellwig case FS_IOC_GETFLAGS: 24766cbff00fSChristoph Hellwig return btrfs_ioctl_getflags(file, argp); 24776cbff00fSChristoph Hellwig case FS_IOC_SETFLAGS: 24786cbff00fSChristoph Hellwig return btrfs_ioctl_setflags(file, argp); 24796cbff00fSChristoph Hellwig case FS_IOC_GETVERSION: 24806cbff00fSChristoph Hellwig return btrfs_ioctl_getversion(file, argp); 2481f7039b1dSLi Dongyang case FITRIM: 2482f7039b1dSLi Dongyang return btrfs_ioctl_fitrim(file, argp); 2483f46b5a66SChristoph Hellwig case BTRFS_IOC_SNAP_CREATE: 2484fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 0); 2485fdfb1e4fSLi Zefan case BTRFS_IOC_SNAP_CREATE_V2: 2486fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create_v2(file, argp, 0); 24873de4586cSChris Mason case BTRFS_IOC_SUBVOL_CREATE: 2488fa0d2b9bSLi Zefan return btrfs_ioctl_snap_create(file, argp, 1); 248976dda93cSYan, Zheng case BTRFS_IOC_SNAP_DESTROY: 249076dda93cSYan, Zheng return btrfs_ioctl_snap_destroy(file, argp); 24910caa102dSLi Zefan case BTRFS_IOC_SUBVOL_GETFLAGS: 24920caa102dSLi Zefan return btrfs_ioctl_subvol_getflags(file, argp); 24930caa102dSLi Zefan case BTRFS_IOC_SUBVOL_SETFLAGS: 24940caa102dSLi Zefan return btrfs_ioctl_subvol_setflags(file, argp); 24956ef5ed0dSJosef Bacik case BTRFS_IOC_DEFAULT_SUBVOL: 24966ef5ed0dSJosef Bacik return btrfs_ioctl_default_subvol(file, argp); 2497f46b5a66SChristoph Hellwig case BTRFS_IOC_DEFRAG: 24981e701a32SChris Mason return btrfs_ioctl_defrag(file, NULL); 24991e701a32SChris Mason case BTRFS_IOC_DEFRAG_RANGE: 25001e701a32SChris Mason return btrfs_ioctl_defrag(file, argp); 2501f46b5a66SChristoph Hellwig case BTRFS_IOC_RESIZE: 25024bcabaa3SChristoph Hellwig return btrfs_ioctl_resize(root, argp); 2503f46b5a66SChristoph Hellwig case BTRFS_IOC_ADD_DEV: 25044bcabaa3SChristoph Hellwig return btrfs_ioctl_add_dev(root, argp); 2505f46b5a66SChristoph Hellwig case BTRFS_IOC_RM_DEV: 25064bcabaa3SChristoph Hellwig return btrfs_ioctl_rm_dev(root, argp); 2507f46b5a66SChristoph Hellwig case BTRFS_IOC_BALANCE: 2508f46b5a66SChristoph Hellwig return btrfs_balance(root->fs_info->dev_root); 2509f46b5a66SChristoph Hellwig case BTRFS_IOC_CLONE: 2510c5c9cd4dSSage Weil return btrfs_ioctl_clone(file, arg, 0, 0, 0); 2511c5c9cd4dSSage Weil case BTRFS_IOC_CLONE_RANGE: 25127a865e8aSChristoph Hellwig return btrfs_ioctl_clone_range(file, argp); 2513f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_START: 2514f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_start(file); 2515f46b5a66SChristoph Hellwig case BTRFS_IOC_TRANS_END: 2516f46b5a66SChristoph Hellwig return btrfs_ioctl_trans_end(file); 2517ac8e9819SChris Mason case BTRFS_IOC_TREE_SEARCH: 2518ac8e9819SChris Mason return btrfs_ioctl_tree_search(file, argp); 2519ac8e9819SChris Mason case BTRFS_IOC_INO_LOOKUP: 2520ac8e9819SChris Mason return btrfs_ioctl_ino_lookup(file, argp); 25211406e432SJosef Bacik case BTRFS_IOC_SPACE_INFO: 25221406e432SJosef Bacik return btrfs_ioctl_space_info(root, argp); 2523f46b5a66SChristoph Hellwig case BTRFS_IOC_SYNC: 2524f46b5a66SChristoph Hellwig btrfs_sync_fs(file->f_dentry->d_sb, 1); 2525f46b5a66SChristoph Hellwig return 0; 252646204592SSage Weil case BTRFS_IOC_START_SYNC: 252746204592SSage Weil return btrfs_ioctl_start_sync(file, argp); 252846204592SSage Weil case BTRFS_IOC_WAIT_SYNC: 252946204592SSage Weil return btrfs_ioctl_wait_sync(file, argp); 2530f46b5a66SChristoph Hellwig } 2531f46b5a66SChristoph Hellwig 2532f46b5a66SChristoph Hellwig return -ENOTTY; 2533f46b5a66SChristoph Hellwig } 2534